Update cachix/cachix-action action to v14

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
cachix/cachix-action	action	major	v10 -> v14

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Release Notes

cachix/cachix-action (cachix/cachix-action)

v14: cachix-action-v14

Compare Source

https://blog.cachix.org/posts/2024-01-12-cachix-v1-7/

v13: cachix-action-v13

Compare Source

• run on node20
• add skipAddingSubstituter to skip running cachix use

v12: cachix-action-v12

Compare Source

Fix save-state deprecation warning.

v11: cachix-action-v11

Compare Source

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

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