Update nix-community/cache-nix-action action to v5.2.1

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
nix-community/cache-nix-action	action	minor	v5.1.0 -> v5.2.1

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Release Notes

nix-community/cache-nix-action (nix-community/cache-nix-action)

v5.2.1

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What's Changed

• Fix restore despite primary-key hit by @​deemp in https://github.com/nix-community/cache-nix-action/pull/45

Full Changelog: nix-community/cache-nix-action@v5...v5.2.1

v5.2.0

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• Support two backends for the cache package (https://github.com/nix-community/cache-nix-action/pull/40):
  • Add the backend input (there's an issue though)
  • Add BuildJet/toolkit fork (link).
  • Add actions/toolkit fork (link).
• Fix setting outputs (nix-community/cache-nix-action@1543078).

v5.1.3

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Fix #​35 by merging changes from actions/cache.

v5.1.2

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Fix missing .sql script - partially fixes https://github.com/nix-community/cache-nix-action/issues/34

v5.1.1

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• Fix merging stores (https://github.com/nix-community/cache-nix-action/issues/31)

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