Preparation for v2.11.1 patch release (#4752)

* Update README.rst - Add missing comma in the list of acknowlegements (#4750)

* Disable `PYBIND11_ASSERT_GIL_HELD_INCREF_DECREF` generally for PyPy (not just PyPy Windows). (#4751)

* Update changelog

* Provide `PYBIND11_NO_ASSERT_GIL_HELD_INCREF_DECREF` as an option (#4753)

* Remove GIL checks

* Update common.h

* Add flag

* style: pre-commit fixes

* Update pytypes.h

* style: pre-commit fixes

* Update common.h

* style: pre-commit fixes

* Update pytypes.h

* style: pre-commit fixes

* Update common.h

* style: pre-commit fixes

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Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>

* Update changelog: PR #4753

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Co-authored-by: bzaar <slepov@gmail.com>
Co-authored-by: Ethan Steinberg <ethan.steinberg@gmail.com>
Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>