Drop support for python 3.7

[lebrice]

• Drops support for Python 3.7:
• Updates the pre-commit hooks to include the --select=UP flag (pyupgrade equivalent with ruff)
• Updates the build workflow
• Removes unnecessary checks / imports from python 3.7

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 60.59%. Comparing base (6363e05) to head (981ffd4).
Report is 23 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #95      +/-   ##
==========================================
+ Coverage   52.49%   60.59%   +8.10%     
==========================================
  Files           9        9              
  Lines        1364     1368       +4     
==========================================
+ Hits          716      829     +113     
+ Misses        648      539     -109     

Flag	Coverage Δ
integrationtests	?
unittests	60.59% <100.00%> (+9.93%)	⬆️

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