chore(deps): bump greenlet from 3.5.3 to 3.5.4

[dependabot]

Bumps greenlet from 3.5.3 to 3.5.4.

Changelog

Sourced from greenlet's changelog.

3.5.4 (2026-07-22)

• Fix a crash (segfault) on free-threaded builds of Python 3.14 and later when the garbage collector runs while a greenlet that was started from a non-empty C-stack-reference state is active. See issue 515 <https://github.com/python-greenlet/greenlet/issues/515>_. Thanks to ddorian and Kumar Aditya.

• Fix a potential use-after-free on free-threaded builds of Python 3.14 and later when the garbage collector runs while a greenlet is suspended holding a _PyCStackRef (for example, mid attribute resolution). See issue 515 <https://github.com/python-greenlet/greenlet/issues/515>_. Thanks to ddorian and Kumar Aditya.

• Fix a deadlock on free-threaded builds when a greenlet switch happened while a PyCriticalSection was held -- for example inside asyncio's Task.__step, which holds one on the running task for the duration of the step. See PR 519 <https://github.com/python-greenlet/greenlet/pull/519/>. Thanks to ddorian and Kumar Aditya.

.. note:: Binary 3.15 wheels are now built with Python 3.15b4. These may not be compatible with earlier or later versions of 3.15. Binary 3.15 wheels of greenlet from previous releases (e.g., 3.5.3) may not be compatible with Python 3.15b4.

Commits

• 384be88 Preparing release 3.5.4
• bbdf57b Add note to CHANGES about versions of 3.15 binary wheels may/not be compatibl...
• 7599023 Merge pull request #517 from ddorian/issue515-c-stack-refs
• 73a0a1a Fix the suspended C-stack-ref GC test to catch its regression
• 1ff35f4 Merge branch 'master' into issue515-c-stack-refs
• 847fb82 Merge pull request #520 from dynapx/fix-test-extension-npd
• 0b471ba Merge pull request #519 from ddorian/freethread-switch-critical-section
• d55914d Simplify the CHANGES.rst entry
• 78932dc Change notes are for end users, they don't need to go into technical detail
• 39bf70c Hold the C-stack ref snapshot in a std::vector<OwnedObject>
• Additional commits viewable in compare view

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