Bump cachix/install-nix-action from 24 to 25

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
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

.github/workflows/ci.yml

@@ -66,7 +66,7 @@ jobs:
         solc-select use 0.5.7 --always-install
     - 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'
       uses: cachix/cachix-action@v13