- update to 3.0.0~rc3:
  * Fix an intermittent error during process termination on some
    platforms (GCC/Linux/libstdc++).
  * 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."
  * Python 3.12: Fix walking the frame stack of suspended greenlets.
    Previously accessing ``glet.gr_frame.f_back`` would crash due to
    `changes in CPython's undocumented internal frame handling
  * Make the platform-specific low-level C/assembly snippets stop using
    the ``register`` storage class. Newer versions of standards remove

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