Update dependency greenlet to v3.5.3

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
greenlet (changelog)	==3.5.0 → ==3.5.3

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Release Notes

python-greenlet/greenlet (greenlet)

v3.5.3

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• Fix a crash on free-threaded builds when multiple greenlets were
  holding a critical section on an object and the GIL for the thread
  was dropped. See issue 513 <https://github.com/python-greenlet/greenlet/issues/513>_. Thanks
  to ddorian.

v3.5.2

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• The minimum supported version of Python 3.15 is now 3.15b2.
• Fix some garbage-collection related crashes on free-threaded Python
  3.15. Thanks to Kumar Aditya in PR #&#8203;511 <https://github.com/python-greenlet/greenlet/pull/511>_.
• Improve garbage collection of greenlets. This mostly applies to
  Python 3.15. Thanks to Kumar Aditya in PR #&#8203;512 <https://github.com/python-greenlet/greenlet/pull/512>_.

v3.5.1

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• Add preliminary support for Python 3.15b1. This has not been
  reviewed by CPython core developers, but all tests pass. Binary
  wheels of this version won't work on earlier Python 3.15 builds and
  may not work on later 3.15 builds.
• Fix the discrepancy in the way the two getcurrent APIs behave
  during greenlet teardown. One API (the C API used by, e.g., gevent) raised a
  RuntimeError; the other (the Python greenlet.getcurrent API)
  returned None. This second way is incompatible with greenlet's type
  annotations, so greenlet.getcurrent now raises a
  RuntimeError as well.

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