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

Bumps [cachix/install-nix-action](https://github.com/cachix/install-nix-action) from 23 to 25.
- [Release notes](https://github.com/cachix/install-nix-action/releases)
- [Commits](cachix/install-nix-action@v23...v25)

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

Signed-off-by: dependabot[bot] <support@github.com>

.github/workflows/check.yml

@@ -17,7 +17,7 @@ jobs:
     runs-on: ${{ matrix.runsOn }}
     steps:
       - uses: actions/checkout@v4
-      - uses: cachix/install-nix-action@v23
+      - uses: cachix/install-nix-action@v25
       - uses: cachix/cachix-action@v14
         with:
           name: igm
@@ -36,7 +36,7 @@ jobs:
     runs-on: ${{ matrix.runsOn }}
     steps:
       - uses: actions/checkout@v4
-      - uses: cachix/install-nix-action@v23
+      - uses: cachix/install-nix-action@v25
       - uses: cachix/cachix-action@v14
         with:
           name: igm
@@ -57,7 +57,7 @@ jobs:
     steps:
       - run: sudo apt-get clean
       - uses: actions/checkout@v4
-      - uses: cachix/install-nix-action@v23
+      - uses: cachix/install-nix-action@v25
       - uses: cachix/cachix-action@v14
         with:
           name: igm
@@ -73,7 +73,7 @@ jobs:
     runs-on: ${{ matrix.runsOn }}
     steps:
       - uses: actions/checkout@v4
-      - uses: cachix/install-nix-action@v23
+      - uses: cachix/install-nix-action@v25
       - uses: cachix/cachix-action@v14
         with:
           name: igm