Bump greenlet from 2.0.2 to 3.0.0 in /3rdparty/py

[dependabot]

Bumps greenlet from 2.0.2 to 3.0.0.

Changelog

Sourced from greenlet's changelog.

3.0.0 (2023-10-02)

• No changes from 3.0rc3 aside from the version number.

3.0.0rc3 (2023-09-12)

• Fix an intermittent error during process termination on some platforms (GCC/Linux/libstdc++).

3.0.0rc2 (2023-09-09)

• Fix some potential bugs (assertion failures and memory leaks) in previously-untested error handling code. In some cases, this means that the process will execute a controlled abort() after severe trouble when previously the process might have continued for some time with a corrupt state. It is unlikely those errors occurred in practice.
• Fix some assertion errors and potential bugs with re-entrant switches.
• Fix a potential crash when certain compilers compile greenlet with high levels of optimization. The symptom would be that switching to a greenlet for the first time immediately crashes.
• Fix a potential crash when the callable object passed to the greenlet constructor (or set as the greenlet.run attribute) has a destructor attached to it that switches. Typically, triggering this issue would require an unlikely subclass of greenlet.greenlet.
• Python 3.11+: Fix rare switching errors that could occur when a garbage collection was triggered during the middle of a switch, and Python-level code in __del__ or weakref callbacks switched to a different greenlet and ultimately switched back to the original greenlet. This often manifested as a SystemError: "switch returned NULL without an exception set."

For context on the fixes, see gevent issue [#1985](https://github.com/python-greenlet/greenlet/issues/1985) <https://github.com/gevent/gevent/issues/1985>_.

3.0.0rc1 (2023-09-01)

• Windows wheels are linked statically to the C runtime in an effort to prevent import errors on systems without the correct C runtime installed. It's not clear if this will make the situation better or worse, so please share your experiences in issue 346 <https://github.com/python-greenlet/greenlet/issues/346>_.

... (truncated)

Commits

• ef510e4 Preparing release 3.0.0
• 8b24b4d Updating change log.
• 79f6351 Back to development: 3.0.0rc4
• 715128a Preparing release 3.0.0rc3
• f2ecf0c D'oh, tstate is used under Py 3.11+. UNUSED breaks compilation on windows.
• 7451810 Finish refactoring to separate files.
• 748a9e0 Fix an intermittent error during process termination on GCC/Linux/libstdc++.
• cec93b1 Move BrokenGreenlet to its own file.
• 0b108b3 Move UserGreenlet code to its own file.
• 215d0c9 Moving Greenlet, module globals and thread state destruction to their own files.
• Additional commits viewable in compare view

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[dependabot]

Superseded by #449.