drop 3.8, add pytest-retry

[codecov[bot]]

Codecov Report

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

Project coverage is 95.11%. Comparing base (33098ba) to head (87522f0).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #592 +/- ## ========================================== - Coverage 95.14% 95.11% -0.04% ========================================== Files 36 37 +1 Lines 2206 2209 +3 ========================================== + Hits 2099 2101 +2 - Misses 107 108 +1 ``` | [Flag](https://app.codecov.io/gh/sigma67/ytmusicapi/pull/592/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=sigma67) | Coverage Δ | | |---|---|---| | [unittests](https://app.codecov.io/gh/sigma67/ytmusicapi/pull/592/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=sigma67) | `95.11% <100.00%> (-0.04%)` | :arrow_down: | Flags with carried forward coverage won't be shown. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=sigma67#carryforward-flags-in-the-pull-request-comment) to find out more.

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