Pin Python 3.7 builds to ubuntu 22.04

[mrbean-bremen]

• the newest runner has changed to 24.04, which has no Python 3.7 support

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 98.50%. Comparing base (19dae40) to head (5d48625).
Report is 60 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #162      +/-   ##
==========================================
+ Coverage   97.21%   98.50%   +1.28%     
==========================================
  Files           5        5              
  Lines         575      601      +26     
  Branches      136      131       -5     
==========================================
+ Hits          559      592      +33     
+ Misses          9        2       -7     
  Partials        7        7              

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