chore: Migrate to platformdirs

[lewisjared]

Description

Migrate to platformdirs

Checklist

Please confirm that this pull request has done the following:

• [ ] Tests added
• [x] Documentation added (where applicable)
• [x] Changelog item added to changelog/

[codecov-commenter]

Codecov Report

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

Project coverage is 91.98%. Comparing base (1532362) to head (c7ba062).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #108 +/- ## ======================================= Coverage 91.98% 91.98% ======================================= Files 15 15 Lines 674 674 Branches 72 72 ======================================= Hits 620 620 Misses 31 31 Partials 23 23 ```

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