chore(deps): use replace appdirs by platformdirs

[deronnax]

closes #661

[codecov-commenter]

Codecov Report

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

Comparison is base (72ef937) 91.95% compared to head (a34dada) 91.95%.

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Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #842 +/- ## ======================================= Coverage 91.95% 91.95% ======================================= Files 168 168 Lines 6987 6987 ======================================= Hits 6425 6425 Misses 562 562 ``` | [Flag](https://app.codecov.io/gh/GitGuardian/ggshield/pull/842/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=GitGuardian) | Coverage Δ | | |---|---|---| | [unittests](https://app.codecov.io/gh/GitGuardian/ggshield/pull/842/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=GitGuardian) | `91.95% <100.00%> (ø)` | | 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=GitGuardian#carryforward-flags-in-the-pull-request-comment) to find out more.

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