Bump cachix/install-nix-action from 24 to 25 (#2286)

Bumps [cachix/install-nix-action](https://github.com/cachix/install-nix-action) from 24 to 25.
- [Release notes](https://github.com/cachix/install-nix-action/releases)
- [Commits](cachix/install-nix-action@v24...v25)

---
updated-dependencies:
- dependency-name: cachix/install-nix-action
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

.github/workflows/ci.yml

@@ -67,7 +67,7 @@ jobs:
 
       - name: Set up nix
         if: matrix.type == 'dapp'
-        uses: cachix/install-nix-action@v24
+        uses: cachix/install-nix-action@v25
 
       - name: Set up cachix
         if: matrix.type == 'dapp'