Drop support for Python 3.8

[mr-c]

Do not merge and release until Python 3.8 has been officially declared "end-of-life" (Presumed to be October 31st or earlier, 2024).

[codecov]

Codecov Report

Attention: Patch coverage is 99.46524% with 1 line in your changes missing coverage. Please review.

Project coverage is 83.11%. Comparing base (e174773) to head (d793d95).

Files with missing lines	Patch %	Lines
schema_salad/schema.py	95.23%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #877      +/-   ##
==========================================
+ Coverage   83.07%   83.11%   +0.04%     
==========================================
  Files          22       22              
  Lines        4886     4898      +12     
  Branches     1326     1325       -1     
==========================================
+ Hits         4059     4071      +12     
  Misses        548      548              
  Partials      279      279              

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