* Upgrade Python to version 3.11 (Faster CPython)
* Update pyupgrade config for Python 3.11
* Update tox env to Python 3.11
* Update to latest Python 3.11.3
* Add a note about lack of support in PythonAnywhere
* Rephrase note
* Fix casing
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Co-authored-by: Bruno Alla <alla.brunoo@gmail.com>
Co-authored-by: Bruno Alla <browniebroke@users.noreply.github.com>