Bump cachix/install-nix-action from 29 to 30

Bumps [cachix/install-nix-action](https://github.com/cachix/install-nix-action) from 29 to 30.
- [Release notes](https://github.com/cachix/install-nix-action/releases)
- [Commits](https://github.com/cachix/install-nix-action/compare/v29...v30)

---
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/ci.yml

@@ -15,7 +15,7 @@ jobs:
       uses: actions/checkout@v4.2.0
 
     - name: Install Nix
-      uses: cachix/install-nix-action@v29
+      uses: cachix/install-nix-action@v30
       with:
         nix_path: nixpkgs=channel:nixos-unstable
 
@@ -53,7 +53,7 @@ jobs:
       uses: actions/checkout@v4.2.0
 
     - name: Install Nix
-      uses: cachix/install-nix-action@v29
+      uses: cachix/install-nix-action@v30
       with:
         nix_path: nixpkgs=channel:nixos-unstable
 

.github/workflows/pulls.yml

@@ -11,7 +11,7 @@ jobs:
       matrix: ${{ steps.set-matrix.outputs.matrix }}
     steps:
       - uses: actions/checkout@v4.2.0
-      - uses: cachix/install-nix-action@v29
+      - uses: cachix/install-nix-action@v30
       - id: set-matrix
         name: Evaluate flake
         run: nix flake show --all-systems