Update dependency platformdirs to v3.8.1

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
platformdirs	3.8.0 -> 3.8.1

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Release Notes

platformdirs/platformdirs (platformdirs)

### [`v3.8.1`](https://togithub.com/platformdirs/platformdirs/blob/HEAD/CHANGES.rst#platformdirs-381-2023-07-06) [Compare Source](https://togithub.com/platformdirs/platformdirs/compare/3.8.0...3.8.1) - BSD: provide a fallback for user_runtime_di

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