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/ci.yml

@@ -18,7 +18,7 @@ jobs:
     runs-on: "${{ matrix.os }}"
     steps:
       - uses: actions/checkout@v4
-      - uses: cachix/install-nix-action@v29
+      - uses: cachix/install-nix-action@v30
       - uses: cachix/cachix-action@v15
         with:
           name: tree-grepper
@@ -31,7 +31,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v4
-      - uses: cachix/install-nix-action@v29
+      - uses: cachix/install-nix-action@v30
       - uses: cachix/cachix-action@v15
         with:
           name: tree-grepper

.github/workflows/update_nix.yml

@@ -14,7 +14,7 @@ jobs:
         with:
           ref: main
           ssh-key: ${{ secrets.UPDATE_SSH_KEY }}
-      - uses: cachix/install-nix-action@v29
+      - uses: cachix/install-nix-action@v30
       - run: nix flake update
       - name: Create PR
         env: