Bump tokio from 0.2.18 to 1.8.4

[dependabot[bot]]

Bumps tokio from 0.2.18 to 1.8.4.

Release notes

Sourced from tokio's releases.

Tokio v1.8.4

1.8.4 (November 15, 2021)

This release backports a bugfix for a data race when sending and receiving on a closed oneshot channel ([RUSTSEC-2021-0124]) from v1.13.1.

Fixed

• sync: fix a data race between oneshot::Sender::send and awaiting a oneshot::Receiver when the oneshot has been closed (#4226)

Tokio v1.8.3

1.8.3 (July 22, 2021)

This release backports two fixes from 1.9.0

Fixed

• Fix leak if output of future panics on drop (#3967)
• Fix leak in LocalSet (#3978)

#3967: tokio-rs/tokio#3967 #3978: tokio-rs/tokio#3978

Tokio 1.8.2

Fixes a missed edge case from 1.8.1.

Fixed

• runtime: drop canceled future on next poll (#3965)

Tokio 1.8.1

Forward ports 1.5.1 fixes.

Fixed

• runtime: remotely abort tasks on JoinHandle::abort (#3934)

#3934: tokio-rs/tokio#3934

tokio-1.8.0

1.8.0 (July 2, 2021)

Added

• io: add get_{ref,mut} methods to AsyncFdReadyGuard and AsyncFdReadyMutGuard (#3807)
• io: efficient implementation of vectored writes for BufWriter (#3163)
• net: add ready/try methods to NamedPipe{Client,Server} (#3866, #3899)
• sync: add watch::Receiver::borrow_and_update (#3813)
• sync: implement From<T> for OnceCell<T> (#3877)

... (truncated)

Commits

• 2273eb1 chore: fix CI on master (#4008)
• 249f05c chore: fix output of macro after new rustc release (#4189)
• 2bf6132 macros: fix type resolution error in #[tokio::main] (#4176)
• c9228bf macros: make tokio-macros attributes more IDE friendly (#4162)
• 441427c macros: fix wrong error messages (#4067)
• cc7d9e1 chore: explicitly relaxed clippy lint for runtime entry macro (#4030)
• f49b7fc tokio-macros: compat with clippy::unwrap_used (#3926)
• ea87e4e net: fix the uds_datagram tests with the latest nightly stdlib (#3952)
• e2e7b5e examples: replace time crate with httpdate (#4169)
• 9a58f7f tests: update Nix to 0.22.0 (#3951)
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