build(deps): bump cachix/install-nix-action from 20 to 26

[dependabot[bot]]

Bumps cachix/install-nix-action from 20 to 26.

Release notes

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

v26

Bump to Nix 2.20.5 to address CVE-2024-27297 / GHSA-2ffj-w4mj-pg37.

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

install-nix-action-v23

• always show Nix trace
• Nix 2.17

install-nix-action-v22

• Nix 2.16.1
• Fix issues with System Integrity Protection when using macos-12

install-nix-action-v21

• pin Nix to 2.15.1 (recent releases broke too many things)
• fix the action to work on custom containers

Commits

• 8887e59 Nix: 2.20.5
• 39a075c bump
• 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
• Additional commits viewable in compare view

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