feat: readded Python 3.11 support

[sven-ruess]

• Added a dev container for testing, if it is running with Python 3.11.X
  • Container is only used for running library_test.py
  • git and local tests are not configured and usable
• Renamed original dev container to "Python 3.12"
• Updated poetry.lock
• Added Python 3.11 in github CI
• Allowed Python 3.11 in pyproject.toml

Dev Container Python 3.12 is used for git and running local tests.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

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Additional details and impacted files

@@           Coverage Diff            @@
##             main      #215   +/-   ##
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  Coverage        ?   100.00%           
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  Files           ?         2           
  Lines           ?        14           
  Branches        ?         0           
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  Hits            ?        14           
  Misses          ?         0           
  Partials        ?         0           

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