ci: fix cleaning caches

[Borda]

What does this PR do?

docs build failing for too large a cache and seem the cleaning actions were broken

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📚 Documentation preview 📚: https://pytorch-lightning--20167.org.readthedocs.build/en/20167/

cc @carmocca @Borda

[github-actions]

⚡ Required checks status: All passing 🟢

No groups match the files changed in this PR.

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Thank you for your contribution! 💜

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