Bump cachix/cachix-action from 10 to 12

[dependabot[bot]]

Bumps cachix/cachix-action from 10 to 12.

Release notes

Sourced from cachix/cachix-action's releases.

cachix-action-v12

Fix save-state deprecation warning.

cachix-action-v11

• Allow pushFilter regex to start with a dash
• Add pathsToPush and cachixArgs
• Avoid pushing .drv.chroot files
• Self-hosted runner support improvements

Commits

• 6a9a34c Merge pull request #126 from sigprof/save-state-deprecated
• 3fea4e0 Use core.saveState instead of raw 'save-state' command
• d035f0e Merge pull request #124 from cachix/test-install-action-v18
• 6f2a21d bump install-nix-action
• 75d46f5 Merge pull request #123 from cachix/install-globally
• b65c184 Allow installing cachix globally for self-hosted runners
• b5a076c Merge pull request #122 from jfroche/feat/update-node
• 9f3d463 feat: support node.js 16
• f5f67ba avoid pushing .drv.chroot files
• bfb6415 Merge pull request #115 from cachix/dependabot/github_actions/cachix/install-...
• Additional commits viewable in compare view

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