build(deps): bump granian from 2.7.9 to 2.8.1

[dependabot]

Bumps granian from 2.7.9 to 2.8.1.

Release notes

Sourced from granian's releases.

Granian 2.8.1

Patch release

Changes since 2.8.0:

• Fix a performance regression on ASGI websockets
• Fix PyFutureAwaitable Python interface
• Enhance RSGI ws transport close strategy
• Relax several atomic operations ordering

Granian 2.8.0

What's Changed

New features

• Add header atom to access log format (#829 by @​nitrag)

Changes

• BREAKING prioritize request's scope over OS env when building WSGI environ dict (#879 by @​Barsoomx)
  • This means conflicting keys won't override WSGI request data anymore
• BREAKING TCP handshake errors are now logged under debug severity
• Add Python 3.15 support
• Drop free-threaded Python 3.13 support
• Bump PyO3 to 0.29 (#820 by @​tobiasge)
• Bump dependencies

Enhancements

• BREAKING Refactor socket sharing on Linux
  • Granian on Linux now requires kernel >= 5.14 and net.ipv4.tcp_migrate_req sysctl option enabled when using multiple workers and respawn features
• BREAKING Implement (non-configurable) backpressure over streamed/iterable responses in ASGI and WSGI protocols
  • This trades a bit of throughput (mostly unnoticeable) for lower memory usage
• Refactor workers main loop and shutdown process

Fixes

• Fix several bugs on shutdown process (thanks @​Malkiz223)
• Fix a shared socket bug on free-threaded Python causing crashes on workers respawn

Commits

• 9a20b17 Update benchmarks
• a69a189 Update benchmarks suite
• ba538c2 Review atomic::Ordering usage
• a5e6b07 Enhance RSGI ws transport locking/closing strategy
• 5a914eb Address perf regression on ASGI websockets
• fd75a79 Fix PyFutureAwaitable Python interface
• 3f94262 Bump version to 2.8.1
• 4599fa4 Allow logger creation on disabled access log
• c032072 Change TCP handshake error log severity to debug (close #720)
• a3bc23c Add header to access log atoms (#829)
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