Bump cachix/install-nix-action from 25 to 26

[dependabot[bot]]

Bumps cachix/install-nix-action from 25 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.

Commits

• 8887e59 Nix: 2.20.5
• 39a075c bump
• See full diff in compare view

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