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](cachix/install-nix-action@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] <[email protected]>

Author: dependabot[bot]

.github/workflows/dependency-update.yaml

@@ -15,5 +15,5 @@ jobs:
         uses: actions/checkout@v4
         with:
           token: ${{ secrets.TOKEN }}
-      - uses: cachix/install-nix-action@v29
+      - uses: cachix/install-nix-action@v30
       - run: nix develop .#git-create-pr -c git-create-pr

.github/workflows/lint-on-push.yaml

@@ -11,5 +11,5 @@ jobs:
     steps:
       - name: Checkout
         uses: actions/checkout@v4
-      - uses: cachix/install-nix-action@v29
+      - uses: cachix/install-nix-action@v30
       - run: nix flake check

.github/workflows/new-release.yaml

@@ -14,5 +14,5 @@ jobs:
         uses: actions/checkout@v4
         with:
           token: ${{ secrets.TOKEN }}
-      - uses: cachix/install-nix-action@v29
+      - uses: cachix/install-nix-action@v30
       - run: nix develop .#new-release -c new-release

.github/workflows/nix-update.yaml

@@ -15,5 +15,5 @@ jobs:
         uses: actions/checkout@v4
         with:
           token: ${{ secrets.TOKEN }}
-      - uses: cachix/install-nix-action@v29
+      - uses: cachix/install-nix-action@v30
       - run: nix develop .#nix-update -c nix-update