Update ruff to 0.7.2 and target python to 3.9

[madtoinou]

Checklist before merging this PR:

• Mentioned all issues that this PR fixes or addresses.
• Summarized the updates of this PR under Summary.
• Added an entry under Unreleased in the Changelog.

Fixes #2547, superseed #2548

Summary

• Update ruff to 0.7.2 (latest release)
• As python3.8 is not supported since bump minimum python version from 3.8 to 3.9 #2586, also update the linting target language to python 3.9; this change has a considerable impact on the typing import and declarations

Additional information

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[dennisbader]

Looks great, thanks @madtoinou 🚀

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 94.09%. Comparing base (dec18b2) to head (3fbcc24).
Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2589      +/-   ##
==========================================
+ Coverage   93.93%   94.09%   +0.15%     
==========================================
  Files         139      139              
  Lines       14888    14882       -6     
==========================================
+ Hits        13985    14003      +18     
+ Misses        903      879      -24     

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