Gipc

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This release adds support for gevent 24.10 and for Python 3.13.

Continuous integration changes:

- Cover CPython 3.13 (Linux, Windows, macOS).
- Switch from testing on macOS 11 to macOS 13.
- Do not test Python 3.8 anymore.

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This release adds support for gevent 23.9.1 and for Python 3.12.

Continuous integration changes:

- Cover CPython 3.12 (Linux, Windows, macOS).
- Switch from testing on macOS 10 to macOS 11.
- Do not test with Python 3.7 anymore.

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This release adds support for gevent 22.12.2 and for Python 3.11.

Continuous integration changes:

- Cover CPython 3.11 (Linux, Windows, macOS).
- Cover PyPy 3.9.
- Do not test with Python 3.6 anymore.

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This release adds support for gevent 21.12.0 and for Python 3.10.

Continuous integration changes:

- Cover CPython 3.10 (Linux, Windows, macOS)
- Cover PyPy 3.8 instead of PyPy 3.6 (Linux, macOS)

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This release adds support for gevent 21.x and CPython 3.8+ on macOS (thanks to
Tyler Willey for crunching through this).

On macOS with CPython 3.8 and newer, gipc now supports the new default
``multiprocessing`` process invocation method which is based on ``spawn()``, similar
to ``CreateProcess()`` on win32. Depending on the needs of your application, you
may want to explore setting the process invocation method back to ``fork()`` via
``multiprocessing.set_start_method('fork')``.

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This release adds support for gevent 21.x on Linux and Windows, tested with
CPython 3.6, 3.7, 3.8, and 3.9.

For macOS, this gipc release still does not support CPython 3.8 and newer.