refactor: Dropped support for Python 3.8

[edgarrmondragon]

---

📚 Documentation preview 📚: https://meltano-sdk--2751.org.readthedocs.build/en/2751/

[codspeed-hq[bot]]

CodSpeed Performance Report

Merging #2751 will not alter performance

_{Comparing 2715-drop-support-for-python-38 (da33047) with main (1ae2bb5)}

:tada: Hooray! pytest-codspeed just leveled up to 3.0.0!

A heads-up, this is a breaking change and it might affect your current performance baseline a bit. But here's the exciting part - it's packed with new, cool features and promises improved result stability :partying_face:! Curious about what's new? Visit our releases page to delve into all the awesome details about this new version.

Summary

✅ 6 untouched benchmarks

[codecov[bot]]

Codecov Report

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

Project coverage is 90.74%. Comparing base (1ae2bb5) to head (da33047). Report is 1 commits behind head on main.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #2751 +/- ## ======================================= Coverage 90.74% 90.74% ======================================= Files 62 62 Lines 5099 5099 Branches 658 658 ======================================= Hits 4627 4627 Misses 330 330 Partials 142 142 ```

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