maint: remove importlib-metadata requirement

[koubaa]

It should not be required anymore in the version range that we support (importlib.metadata is builtin now)

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 87.46%. Comparing base (baa7ac0) to head (501141b).
Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3546      +/-   ##
==========================================
- Coverage   87.48%   87.46%   -0.03%     
==========================================
  Files          58       58              
  Lines       10217    10216       -1     
==========================================
- Hits         8938     8935       -3     
- Misses       1279     1281       +2     

[germa89]

For future references: https://docs.python.org/3/library/importlib.metadata.html

Python documentation

importlib.metadata – Accessing package metadata

Source code: Lib/importlib/metadata/__init__.py importlib.metadata is a library that provides access to the metadata of an installed Distribution Package, such as its entry points or its top-level ...