infra: drop support for Python 3.8

[AbeCoull]

Issue #, if available:

Description of changes:

Testing done:

Merge Checklist

Put an x in the boxes that apply. You can also fill these out after creating the PR. If you're unsure about any of them, don't hesitate to ask. We're here to help! This is simply a reminder of what we are going to look for before merging your pull request.

General

• I have read the CONTRIBUTING doc
• I used the commit message format described in CONTRIBUTING
• I have updated any necessary documentation, including READMEs and API docs (if appropriate)

Tests

• I have added tests that prove my fix is effective or that my feature works (if appropriate)
• I have checked that my tests are not configured for a specific region or account (if appropriate)

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

[codecov]

Codecov Report

All modified lines are covered by tests ✅

Comparison is base (1044c34) 100.00% compared to head (3eb6e71) 100.00%.

Additional details and impacted files

@@            Coverage Diff             @@
##              main      #211    +/-   ##
==========================================
  Coverage   100.00%   100.00%            
==========================================
  Files           48        48            
  Lines         3753      3753            
  Branches       542       910   +368     
==========================================
  Hits          3753      3753            

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.