Bump tokio from 1.25.1 to 1.26.0

[dependabot]

Bumps tokio from 1.25.1 to 1.26.0.

Release notes

Sourced from tokio's releases.

Tokio v1.26.0

Fixed

• macros: fix empty join! and try_join! ([https://redirect.github.com/fix empty join! and try_join! tokio-rs/tokio#5504])
• sync: don't leak tracing spans in mutex guards ([https://redirect.github.com/sync: don't leak tracing spans in mutex guards tokio-rs/tokio#5469])
• sync: drop wakers after unlocking the mutex in Notify ([https://redirect.github.com/Drop wakers after unlocking the mutex in Notify tokio-rs/tokio#5471])
• sync: drop wakers outside lock in semaphore ([https://redirect.github.com/Solve deadlock in Semaphore tokio-rs/tokio#5475])

Added

• fs: add fs::try_exists ([https://redirect.github.com/Add fs::try_exists tokio-rs/tokio#4299])
• net: add types for named unix pipes ([https://redirect.github.com/net: add types for named Unix pipes tokio-rs/tokio#5351])
• sync: add MappedOwnedMutexGuard ([https://redirect.github.com/Add MappedOwnedMutexGuard tokio-rs/tokio#5474])

Changed

• chore: update windows-sys to 0.45 ([https://redirect.github.com/chore: update windows-sys to 0.45 tokio-rs/tokio#5386])
• net: use Message Read Mode for named pipes ([https://redirect.github.com/Named Pipes: Support Message Read Mode tokio-rs/tokio#5350])
• sync: mark lock guards with #[clippy::has_significant_drop] ([https://redirect.github.com/Mark MutexGuard with #[clippy::has_significant_drop] tokio-rs/tokio#5422])
• sync: reduce contention in watch channel ([https://redirect.github.com/Reduce contention in watch channel tokio-rs/tokio#5464])
• time: remove cache padding in timer entries ([https://redirect.github.com/time: remove cache padding in timer entries tokio-rs/tokio#5468])
• time: Improve Instant::now() perf with test-util ([https://redirect.github.com/time: Improve Instant::now() perf with test-util tokio-rs/tokio#5513])

Internal Changes

• io: use poll_fn in copy_bidirectional ([https://redirect.github.com/Use poll_fn in copy_bidirectional tokio-rs/tokio#5486])
• net: refactor named pipe builders to not use bitfields ([https://redirect.github.com/net: refactor named pipe builders to not use bitfields tokio-rs/tokio#5477])
• rt: remove Arc from Clock ([https://redirect.github.com/rt: remove Arc from Clock tokio-rs/tokio#5434])
• sync: make notify_waiters calls atomic ([https://redirect.github.com/sync: make notify_waiters calls atomic tokio-rs/tokio#5458])
• time: don't store deadline twice in sleep entries ([https://redirect.github.com/remove double store of deadline, saving 128 bytes tokio-rs/tokio#5410])

Unstable

• metrics: add a new metric for budget exhaustion yields ([https://redirect.github.com/metrics: add a new metric for budget exhaustion yields tokio-rs/tokio#5517])

Documented

• io: improve AsyncFd example ([https://redirect.github.com/io: improve AsyncFd example tokio-rs/tokio#5481])
• runtime: document the nature of the main future ([https://redirect.github.com/Document the nature of the main future tokio-rs/tokio#5494])
• runtime: remove extra period in docs ([https://redirect.github.com/chore: remove unnecessary dot in comment tokio-rs/tokio#5511])
• signal: updated Documentation for Signals ([https://redirect.github.com/Updated Documentation for Signals tokio-rs/tokio#5459])
• sync: add doc aliases for blocking_* methods ([https://redirect.github.com/sync: add doc aliases for blocking_* methods tokio-rs/tokio#5448])
• sync: fix docs for Send/Sync bounds in broadcast ([https://redirect.github.com/sync: fix docs for Send/Sync bounds in broadcast tokio-rs/tokio#5480])
• sync: document drop behavior for channels ([https://redirect.github.com/sync: document drop behavior for channels tokio-rs/tokio#5497])
• task: clarify what happens to spawned work during runtime shutdown ([https://redirect.github.com/clarify what happens to spawned work during runtime shutdown tokio-rs/tokio#5394])
• task: clarify process::Command docs ([https://redirect.github.com/Clarify process::Command docs (fixing #5406) tokio-rs/tokio#5413])
• task: fix wording with 'unsend' ([https://redirect.github.com/fix: fix wording with 'unsend' tokio-rs/tokio#5452])
• time: document immediate completion guarantee for timeouts ([https://redirect.github.com/time: document immediate completion guarantee for timeouts tokio-rs/tokio#5509])
• tokio: document supported platforms ([https://redirect.github.com/Document supported platforms tokio-rs/tokio#5483])

... (truncated)

Commits

• a377240 chore: prepare for Tokio v1.26.0 release (#5521)
• 52da177 metrics: add a new metric for budget exhaustion yields (#5517)
• ee1c940 time: Improve Instant::now() perf with test-util (#5513)
• 815d89a runtime: remove extra period in docs (#5511)
• 54aaf3d time: document immediate completion guarantee for timeouts (#5509)
• 5a3abe5 net: add types for named unix pipes (#5351)
• d44b1ca io: ignore SplitByUtf8BoundaryIfWindows test on miri (#5507)
• e23c6f3 signal: updated Documentation for Signals (#5459)
• 0a50cb3 net: fix test compilation failure (#5506)
• 2298679 runtime: document the nature of the main future (#5494)
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