Install Nix

Version updated for https://github.com/cachix/install-nix-action to version v31.2.0.

• This action is used across all versions by 32,056 repositories.

Go to the GitHub Marketplace to find the latest changes.

Release notes

What’s Changed

• nix: 2.26.3 -> 2.28.2 by @Mic92 in https://github.com/cachix/install-nix-action/pull/232

Full Changelog: https://github.com/cachix/install-nix-action/compare/v31.1.0...v31.2.0

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