build(deps): 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] <support@github.com>

Author: dependabot[bot]

.github/workflows/ci.yml

@@ -30,7 +30,7 @@ jobs:
           ref: staging
 
       - name: Install nix
-        uses: cachix/install-nix-action@V28
+        uses: cachix/install-nix-action@v30
 
       - name: Set up cachix
         uses: cachix/cachix-action@v15

.github/workflows/pr.yml

@@ -14,7 +14,7 @@ jobs:
         uses: actions/checkout@v4
 
       - name: Install nix
-        uses: cachix/install-nix-action@V28
+        uses: cachix/install-nix-action@v30
         with:
           extra_nix_config: access-tokens = github.com=${{ github.token }}
 

.github/workflows/update.yml

@@ -15,7 +15,7 @@ jobs:
           ref: staging
 
       - name: Install nix
-        uses: cachix/install-nix-action@V28
+        uses: cachix/install-nix-action@v30
 
       - name: Update everything
         run: |