Bump cachix/install-nix-action from V28 to 30

Bumps [cachix/install-nix-action](https://github.com/cachix/install-nix-action) from V28 to 30. This release includes the previously tagged commit.
- [Release notes](https://github.com/cachix/install-nix-action/releases)
- [Commits](cachix/install-nix-action@V28...v30)

---
updated-dependencies:
- dependency-name: cachix/install-nix-action
  dependency-type: direct:production
...

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

.github/workflows/nix-check.yaml

@@ -12,7 +12,7 @@ jobs:
         uses: actions/checkout@v4
 
       - name: Install Nix ❄
-        uses: cachix/install-nix-action@V28
+        uses: cachix/install-nix-action@v30
         with:
           github_access_token: ${{ secrets.GITHUB_TOKEN }}
 
@@ -35,7 +35,7 @@ jobs:
         uses: actions/checkout@v4
 
       - name: Install Nix ❄
-        uses: cachix/install-nix-action@V28
+        uses: cachix/install-nix-action@v30
         with:
           github_access_token: ${{ secrets.GITHUB_TOKEN }}
 

.github/workflows/ship.yaml

@@ -17,7 +17,7 @@ jobs:
         uses: actions/checkout@v4
 
       - name: Install Nix ❄
-        uses: cachix/install-nix-action@V28
+        uses: cachix/install-nix-action@v30
         with:
           github_access_token: ${{ secrets.GITHUB_TOKEN }}
 
@@ -64,7 +64,7 @@ jobs:
         uses: actions/checkout@v4
 
       - name: Install Nix ❄
-        uses: cachix/install-nix-action@V28
+        uses: cachix/install-nix-action@v30
         with:
           github_access_token: ${{ secrets.GITHUB_TOKEN }}