Fix docs missing version 3.14 in Python compatibilities badge

[matagus]

Checklist:

• I'm following the Contributing Guidelines.
• I have added the relevant tests for this change.
• I have updated the README.md file accordingly (if necessary).

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 78.72%. Comparing base (700c3f6) to head (6c3552d).

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #20   +/-   ##
=======================================
  Coverage   78.72%   78.72%           
=======================================
  Files          12       12           
  Lines          94       94           
=======================================
  Hits           74       74           
  Misses         20       20           

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