Update dependency platformdirs to v4

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
platformdirs	^3.0.0 -> ^4.0.0

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Release Notes

platformdirs/platformdirs (platformdirs)

### [`v4.0.0`](https://togithub.com/platformdirs/platformdirs/releases/tag/4.0.0) [Compare Source](https://togithub.com/platformdirs/platformdirs/compare/3.11.0...4.0.0) #### What's Changed - site_cache_dir: Use `/var/cache` again instead of `/var/tmp` on UNIX by [@​andersk](https://togithub.com/andersk) in [https://github.com/platformdirs/platformdirs/pull/239](https://togithub.com/platformdirs/platformdirs/pull/239) #### New Contributors - [@​andersk](https://togithub.com/andersk) made their first contribution in [https://github.com/platformdirs/platformdirs/pull/239](https://togithub.com/platformdirs/platformdirs/pull/239) **Full Changelog**: https://github.com/platformdirs/platformdirs/compare/3.11.0...4.0.0

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