maint: Drop 3.9 support

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 60.53%. Comparing base (f8eab30) to head (6242c42).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #122 +/- ## ======================================= Coverage 60.53% 60.53% ======================================= Files 24 24 Lines 821 821 ======================================= Hits 497 497 Misses 324 324 ```

:umbrella: View full report in Codecov by Sentry.
:loudspeaker: Have feedback on the report? Share it here.