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]>

.github/workflows/ci.yml

@@ -117,7 +117,7 @@ jobs:
         run: |
           sudo rm -rf /usr/local/* /usr/share/* /opt/*
           docker rmi $(docker image ls -aq)
-      - uses: cachix/install-nix-action@v29
+      - uses: cachix/install-nix-action@v30
       - uses: DeterminateSystems/magic-nix-cache-action@v8
       - uses: cachix/cachix-action@v15
         with:
@@ -139,7 +139,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v4
-      - uses: cachix/install-nix-action@v29
+      - uses: cachix/install-nix-action@v30
       - uses: DeterminateSystems/magic-nix-cache-action@v8
       - uses: cachix/cachix-action@v15
         with:

.github/workflows/update-flake-lock.yml

@@ -10,7 +10,7 @@ jobs:
       - name: Checkout repository
         uses: actions/checkout@v4
       - name: Install Nix
-        uses: cachix/install-nix-action@v29
+        uses: cachix/install-nix-action@v30
       - name: Update flake.lock
         uses: DeterminateSystems/update-flake-lock@v24
         with: