Update mio requirement from 0.7.7 to 0.8.0

[dependabot[bot]]

Updates the requirements on mio to permit the latest version.

Release notes

Sourced from mio's releases.

Mio v0.8

This will Mio's last unstable version, the next version will be v1 and introduce a stable API.

The main change in this release is the removal of the TcpSocket type, it's replace by the socket2 crate.

See the change log for more changes.

Changelog

Sourced from mio's changelog.

0.8.0

Removed

• Deprecated features (https://github.com/tokio-rs/mio/commit/105f8f2afb57b01ddea716a0aa9720f226c520e3):
  • extra-docs (always enabled)
  • tcp (replaced with "net" feature).
  • udp (replaced with "net" feature).
  • uds (replaced with "net" feature).
  • pipe (replaced with "os-ext" feature).
• TcpSocket type (https://github.com/tokio-rs/mio/commit/02e9be41f27daf822575444fdd2b3067433a5996). The socket2 crate provides all the functionality and more.
• Support for Solaris, it never really worked anyway (tokio-rs/mio#1528).

Changes

• Update minimum Rustc version (MSVR) to 1.46.0 (https://github.com/tokio-rs/mio/commit/5c577efecd23750a9a3e0f6ad080ab98f14a255d).

Added

• UdpSocket::peer_addr (https://github.com/tokio-rs/mio/commit/5fc104d08e0e74c8a19247f7cba0f058699fc438).

0.7.14

Fixes

• Remove use unsound internal macro (#1519).

Added

• sys::unix::SocketAddr::as_abstract_namespace() (#1520).

0.7.13

Fixes

• Fix Registry::try_clone invalid usage of F_DUPFD_CLOEXEC (#1497, https://github.com/tokio-rs/mio/commit/2883f5c1f35bf1a59682c5ffc4afe6b97d7d6e68).

0.7.12 (yanked)

Fixes

• Set FD_CLOEXEC when calling Registry::try_clone (https://github.com/tokio-rs/mio/commit/d1617b567ff6bc669d71e367d22e0e93ff7e2e24 for epoll and (https://github.com/tokio-rs/mio/commit/b367a05e408ca90a26383c3aa16d8a16f019dc59 for kqueue).

... (truncated)

Commits

• 5234b5f Release v0.8.0
• 41a494b Fix Clippy warning
• a8c5756 Add changelog for v0.8
• 7029a35 Add v0.7.14 change log
• dca2134 Fix feature flags for some tests files
• b9f089b Remove cfg attributes for Solaris
• 7d86108 Add section about raw fd to portability guidelines
• 3be5811 Add note about short receive on datagram sockets
• 3ca57f3 Document unconnected TcpStream returned by TcpStream::connect
• 47cf59c Deregister connection before dropping it in TCP example
• Additional commits viewable in compare view

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[djc]

I think we want to hold off on this until tokio upgrades?

[Ralith]

Yeah, let's not have a duplicate dep.

[dependabot[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. You can also ignore all major, minor, or patch releases for a dependency by adding an ignore condition with the desired update_types to your config file.

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