Bump Ruff to 0.8.0

[AlexWaygood]

Hi! I just released Ruff 0.8.0. This release removes a few rules that had been deprecated for a few releases, so Ruff 0.8.0 would have started emitting warnings when linting trio due to the fact that you have some of these now-removed rules explicitly ignored in your Ruff config.

This PR gets rid of the removed rules from your Ruff config. There's also some additional changes made here; let me know if any of them are undesirable, and I can revert them:

• Some changes due to the recoding of the flake8-type-checking rules from TCH to TC
• Some changes due to the addition of the preview rule unraw-re-pattern
• Some changes due to the addition of the preview rule redundant-none-literal

[AlexWaygood]

(I'm happy to add a news entry if this needs one!)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.62%. Comparing base (34e7a2e) to head (82028f1).
Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #3143   +/-   ##
=======================================
  Coverage   99.62%   99.62%           
=======================================
  Files         122      122           
  Lines       18400    18400           
  Branches     1223     1223           
=======================================
  Hits        18331    18331           
  Misses         47       47           
  Partials       22       22           

Files with missing lines	Coverage Δ
src/trio/_dtls.py	97.50% <ø> (ø)
src/trio/_socket.py	100.00% <100.00%> (ø)
src/trio/_subprocess_platform/__init__.py	100.00% <100.00%> (ø)
src/trio/_tests/test_testing_raisesgroup.py	100.00% <100.00%> (ø)
src/trio/_tests/test_threads.py	100.00% <100.00%> (ø)
src/trio/testing/_raises_group.py	100.00% <100.00%> (ø)

---- 🚨 Try these New Features:

• Flaky Tests Detection - Detect and resolve failed and flaky tests

[trio-bot]

Hey @AlexWaygood, it looks like that was the first time we merged one of your PRs! Thanks so much! 🎉 🎂

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