Bump cachix/install-nix-action from 23 to 25

[dependabot[bot]]

Bumps cachix/install-nix-action from 23 to 25.

Release notes

Sourced from cachix/install-nix-action's releases.

install-nix-action-v25

Nix 2.19.2

install-nix-action-v24

• Nix 2.19.1
• enables KVM on linux
• set TMPDIR to avoid potential disk space issues
• don't use the default GitHub token for Enterprise

Commits

• 6004951 Nix: 2.19.1 -> 2.19.2
• 7ac1ec2 Nix 2.19.1
• dc33a21 Merge pull request #200 from cachix/fix/196
• 2b90cd3 Merge pull request #202 from cachix/feature/kvm
• fe19c91 feat: enable KVM on Linux if available
• a56e3a8 Merge pull request #199 from jalaziz/tempdir
• 81eb746 Update install-nix.sh
• 97a1be3 fix: don't use the default GitHub token for Enterprise
• 2cce1fd fix: Set TMPDIR to avoid disk space issues
• 300721f Merge pull request #193 from cachix/dependabot/github_actions/actions/checkout-4
• Additional commits viewable in compare view

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