Add python 3.11

[klaasnicolaas]

Also:

• Update the badges
• Update poetry dependencies

[codecov]

Codecov Report

Base: 100.00% // Head: 100.00% // No change to project coverage 👍

Coverage data is based on head (2d77f8e) compared to base (2154a8c).
Patch has no changes to coverable lines.

Additional details and impacted files

@@            Coverage Diff            @@
##              main      #310   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            4         4           
  Lines           80        80           
  Branches         6         6           
=========================================
  Hits            80        80           

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