removed 3.8 support, bumped min to 3.9

[zerothi]

• Closes Drop Python 3.8 support in May 2024 #640
• Added tests for new/changed functions?
• Ran isort . and black . [24.2.0] at top-level
• Documentation for functionality in docs/
• Changes documented in CHANGELOG.md

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 86.77%. Comparing base (005c5ba) to head (da460f9).
Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #761      +/-   ##
==========================================
- Coverage   86.78%   86.77%   -0.01%     
==========================================
  Files         410      410              
  Lines       51827    51822       -5     
==========================================
- Hits        44977    44971       -6     
- Misses       6850     6851       +1     

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