chore(deps): update determinatesystems/magic-nix-cache-action action to v3

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
DeterminateSystems/magic-nix-cache-action	action	major	v2 -> v3

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Release Notes

DeterminateSystems/magic-nix-cache-action (DeterminateSystems/magic-nix-cache-action)

### [`v3`](https://togithub.com/DeterminateSystems/magic-nix-cache-action/releases/tag/v3) [Compare Source](https://togithub.com/DeterminateSystems/magic-nix-cache-action/compare/v2...v3) #### What's Changed - Provide docs for upstream cache by [@​lucperkins](https://togithub.com/lucperkins) in [https://github.com/DeterminateSystems/magic-nix-cache-action/pull/17](https://togithub.com/DeterminateSystems/magic-nix-cache-action/pull/17) - DS-970: Add Magic Nix Cache and other workflow changes by [@​flexiondotorg](https://togithub.com/flexiondotorg) in [https://github.com/DeterminateSystems/magic-nix-cache-action/pull/20](https://togithub.com/DeterminateSystems/magic-nix-cache-action/pull/20) - Update README example by [@​edmundmiller](https://togithub.com/edmundmiller) in [https://github.com/DeterminateSystems/magic-nix-cache-action/pull/24](https://togithub.com/DeterminateSystems/magic-nix-cache-action/pull/24) - Correct cache log by [@​grahamc](https://togithub.com/grahamc) in [https://github.com/DeterminateSystems/magic-nix-cache-action/pull/30](https://togithub.com/DeterminateSystems/magic-nix-cache-action/pull/30) - build(action): update node16 to node20 by [@​cameronraysmith](https://togithub.com/cameronraysmith) in [https://github.com/DeterminateSystems/magic-nix-cache-action/pull/32](https://togithub.com/DeterminateSystems/magic-nix-cache-action/pull/32) #### New Contributors - [@​flexiondotorg](https://togithub.com/flexiondotorg) made their first contribution in [https://github.com/DeterminateSystems/magic-nix-cache-action/pull/20](https://togithub.com/DeterminateSystems/magic-nix-cache-action/pull/20) - [@​edmundmiller](https://togithub.com/edmundmiller) made their first contribution in [https://github.com/DeterminateSystems/magic-nix-cache-action/pull/24](https://togithub.com/DeterminateSystems/magic-nix-cache-action/pull/24) - [@​cameronraysmith](https://togithub.com/cameronraysmith) made their first contribution in [https://github.com/DeterminateSystems/magic-nix-cache-action/pull/32](https://togithub.com/DeterminateSystems/magic-nix-cache-action/pull/32) **Full Changelog**: https://github.com/DeterminateSystems/magic-nix-cache-action/compare/v2...v3

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