Bump gevent from 25.8.1 to 26.4.0

[dependabot]

Bumps gevent from 25.8.1 to 26.4.0.

Commits

• 2a096a9 Preparing release 26.4.0
• e80421d Merge pull request #2171 from gevent/ci-py-ver-updates
• 6cfa49b test__ssl.py: PROTOCOL_TLS deprecation fix
• e2ec5eb Fix deprecations about use of SSLContext without setting a protocol.
• 3890402 lint
• 26b5b7f psutil 6 deprecated .connections, use replacement .net_connections
• cbbd53e Clean up some warnings from leakcheck.
• 3840706 test__util is getting extra greenlets when combined with test__threadpool on ...
• 408aeeb test__select: libuv on recent versions of Python isn't producing the OSError ...
• 6b6ee4e Update python versions tested in CI.
• Additional commits viewable in compare view

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 54.68%. Comparing base (9d9ef69) to head (77a7801).
⚠️ Report is 5 commits behind head on main.
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1674   +/-   ##
=======================================
  Coverage   54.68%   54.68%           
=======================================
  Files         336      336           
  Lines       27439    27439           
=======================================
  Hits        15006    15006           
  Misses      12433    12433           

Flag	Coverage Δ
functionaltests	0.00% <ø> (ø)
unittests	54.68% <ø> (ø)

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[dependabot]

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.