Bump github.com/ethereum/go-ethereum from 1.8.27 to 1.9.4

[dependabot-preview[bot]]

Bumps github.com/ethereum/go-ethereum from 1.8.27 to 1.9.4.

Release notes

*Sourced from [github.com/ethereum/go-ethereum's releases](https://github.com/ethereum/go-ethereum/releases).* > ## Frozen Pyjak (v1.9.4) > Geth v1.9.4 is a special maintenance release, that besides fixing issues as usual, also [locks in](https://github-redirect.dependabot.com/ethereum/go-ethereum/pull/20090) the Istanbul hard fork block numbers for the Ropsten, Rinkeby and Görli test networks: > > - Ropsten: `6485846`, scheduled October 2, 2019 ([ref](https://twitter.com/hudsonjameson/status/1174336671342575617)). > - Rinkeby: `5435345`, scheduled November 13, 2019 ([ref](https://twitter.com/peter_szilagyi/status/1174580897980592129)). > - Görli: `1561651`, scheduled October 30, 2019 ([ref](https://twitter.com/a4fri/status/1173939316101386240)). > > **Please update your nodes on the above test networks before the deadlines, otherwise you will end up either on a wrong chain (Ropsten), or stuck altogether (Rinkeby and Görli). The `--override.istanbul` CLI flag can be used to bail out of the fork even last minute if things go sour.** > > --- > > Improvements: > > - Accumulate state writes post-Byzantium and only push into the trie at block end ([#19953](https://github-redirect.dependabot.com/ethereum/go-ethereum/pull/19953)). > - Smarter locking in the transaction pool to avoid some contention ([#20080](https://github-redirect.dependabot.com/ethereum/go-ethereum/pull/20080), [#20081](https://github-redirect.dependabot.com/ethereum/go-ethereum/pull/20081), [#20085](https://github-redirect.dependabot.com/ethereum/go-ethereum/pull/20085)). > > Bugfixes: > > - Fix a USB HID discovery regression on Windows ([#20092](https://github-redirect.dependabot.com/ethereum/go-ethereum/pull/20092)). > - Various stability and balancing fixes for light servers ([#20079](https://github-redirect.dependabot.com/ethereum/go-ethereum/pull/20079)). > - Fix some RLP decoding issues around `nil`s for discv5 ([#20064](https://github-redirect.dependabot.com/ethereum/go-ethereum/pull/20064)). > - Expose the GraphQL port (8547) from our docker images ([#20033](https://github-redirect.dependabot.com/ethereum/go-ethereum/pull/20033)). > - Fix GraphQL UI serving regression caused by gzip encoding ([#20046](https://github-redirect.dependabot.com/ethereum/go-ethereum/pull/20046)). > - Fix GraphQL `address` type decoding to reject invalid strings ([#20046](https://github-redirect.dependabot.com/ethereum/go-ethereum/pull/20046)). > - Fix P2P metric types so they work properly with Influx/Grafana ([#20047](https://github-redirect.dependabot.com/ethereum/go-ethereum/pull/20047)). > > For a full rundown of the changes please consult the Geth 1.9.4 [release milestone](https://github.com/ethereum/go-ethereum/milestone/90?closed=1). > > --- > > As with all our previous releases, you can find the: > > - Pre-built binaries for all platforms on our [downloads page](https://geth.ethereum.org/downloads/). > - Docker images published under [`ethereum/client-go`](https://cloud.docker.com/u/ethereum/repository/docker/ethereum/client-go). > - Ubuntu packages in our [Launchpad PPA repository](https://launchpad.net/~ethereum/+archive/ubuntu/ethereum). > - OSX packages in our [Homebrew Tap repository](https://github.com/ethereum/homebrew-ethereum). > > ## Tasty Tankard (v1.9.3) > Geth v1.9.3 is a regular maintenance release, highlights being finalization of the Istanbul EIPs. > > New Features: > > - Add `eth.fillTransaction` to create-but-not-sign a transaction ([#19915](https://github-redirect.dependabot.com/ethereum/go-ethereum/pull/19915)). > - Support DNS names in enode URLs during `admin.addPeer` ([#18524](https://github-redirect.dependabot.com/ethereum/go-ethereum/pull/18524)). > - Enable gzip compression on the HTTP RPC API endpoint ([#19997](https://github-redirect.dependabot.com/ethereum/go-ethereum/pull/19997)). > - Reduce light client default peer count from 100 to 10 ([#19933](https://github-redirect.dependabot.com/ethereum/go-ethereum/pull/19933)). > - Align CLI flags and descriptions a bit better ([#19956](https://github-redirect.dependabot.com/ethereum/go-ethereum/pull/19956)). > > Istanbul changes ([progress tracker](https://github-redirect.dependabot.com/ethereum/go-ethereum/issues/19919)): > > ... (truncated)

Commits

- [`46891c1`](https://github.com/ethereum/go-ethereum/commit/46891c12ab54c9e179f26378ce618fd48460190c) params: release Geth v1.9.4 stable - [`c0010f0`](https://github.com/ethereum/go-ethereum/commit/c0010f0220769dbe3965ae7d277daa6f04ce5437) Merge pull request [#20092](https://github-redirect.dependabot.com/ethereum/go-ethereum/issues/20092) from karalabe/vendor-usb-bump - [`9f98628`](https://github.com/ethereum/go-ethereum/commit/9f98628dc220e5b7000f29be077be568c3ced51a) vendor: pull in USB Windows fixes - [`a6a14f6`](https://github.com/ethereum/go-ethereum/commit/a6a14f6b712efbfb91a4c0a05eb42998e8dda2ea) Merge pull request [#20090](https://github-redirect.dependabot.com/ethereum/go-ethereum/issues/20090) from soc1c/s1-testnet-istanbul - [`f9eb307`](https://github.com/ethereum/go-ethereum/commit/f9eb3072167603e70b018c295e305d71b69756e3) core/forkid, params: fix tests, enable Istanbul on Rinkeby + testers - [`03c7d8f`](https://github.com/ethereum/go-ethereum/commit/03c7d8fb3139f3fee8ddcf8a35b6a908f582621f) Merge pull request [#20091](https://github-redirect.dependabot.com/ethereum/go-ethereum/issues/20091) from karalabe/cht-1.9.4 - [`2becb99`](https://github.com/ethereum/go-ethereum/commit/2becb995830f3951643cf973fbf29ca313b833b8) params: bump CHTs for the 1.9.4 release - [`ad380cd`](https://github.com/ethereum/go-ethereum/commit/ad380cd57f9b7f8ed748b61b568f8733836ba2e3) params: activate Istanbul on Ropsten and Görli - [`7b32d2a`](https://github.com/ethereum/go-ethereum/commit/7b32d2a47017570c44cd7f8a83612a29656c9857) Merge pull request [#20085](https://github-redirect.dependabot.com/ethereum/go-ethereum/issues/20085) from karalabe/txpool-api-fix - [`f40ff23`](https://github.com/ethereum/go-ethereum/commit/f40ff23b7bf5396936159ae500ed5b18fdaec27d) core: fix tx dedup return error count - Additional commits viewable in [compare view](https://github.com/ethereum/go-ethereum/compare/v1.8.27...v1.9.4)

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[adambabik]

First, we need to bump our fork.

[dependabot-preview[bot]]

OK, I won't notify you again about this release, but will get in touch when a new version is available. If you'd rather skip all updates until the next major or minor version, let me know by commenting @dependabot ignore this major version or @dependabot ignore this minor version.

If you change your mind, just re-open this PR and I'll resolve any conflicts on it.