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docs: Update warning about Python 3.9.0 UB, now that 3.9.1 has been released (#2719)

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.. warning::
Combining older versions of pybind11 (< 2.6.0) with the brand-new Python
3.9.0 will trigger undefined behavior that typically manifests as crashes
during interpreter shutdown (but could also destroy your data. **You have been
Combining older versions of pybind11 (< 2.6.0) with Python 3.9.0 will
trigger undefined behavior that typically manifests as crashes during
interpreter shutdown (but could also destroy your data. **You have been
warned.**)
We recommend that you wait for Python 3.9.1 slated for release in December,
which will include a `fix <https://github.com/python/cpython/pull/22670>`_
that resolves this problem. In the meantime, please update to the latest
version of pybind11 (2.6.0 or newer), which includes a temporary workaround
specifically when Python 3.9.0 is detected at runtime.
We recommend that you update to the latest patch release of Python (3.9.1),
which includes a `fix <https://github.com/python/cpython/pull/22670>`_
that resolves this problem. If you do use Python 3.9.0, please update to
the latest version of pybind11 (2.6.0 or newer), which includes a temporary
workaround specifically when Python 3.9.0 is detected at runtime.
**pybind11** is a lightweight header-only library that exposes C++ types
in Python and vice versa, mainly to create Python bindings of existing