Bump nixbuild/nix-quick-install-action in the github-actions group

Bumps the github-actions group with 1 update: [nixbuild/nix-quick-install-action](https://github.com/nixbuild/nix-quick-install-action).


Updates `nixbuild/nix-quick-install-action` from 28 to 29
- [Release notes](https://github.com/nixbuild/nix-quick-install-action/releases)
- [Changelog](https://github.com/nixbuild/nix-quick-install-action/blob/master/RELEASE)
- [Commits](https://github.com/nixbuild/nix-quick-install-action/compare/v28...v29)

---
updated-dependencies:
- dependency-name: nixbuild/nix-quick-install-action
  dependency-type: direct:production
  update-type: version-update:semver-major
  dependency-group: github-actions
...

Signed-off-by: dependabot[bot] <support@github.com>

.github/workflows/hosts.yml

@@ -28,7 +28,7 @@ jobs:
         ref: ${{ github.head_ref }}
 
     - name: Install nix
-      uses: nixbuild/nix-quick-install-action@v28
+      uses: nixbuild/nix-quick-install-action@v29
       with:
         load_nixConfig: false
         nix_conf: |

.github/workflows/iso.yml

@@ -20,7 +20,7 @@ jobs:
         ref: ${{ github.head_ref }}
 
     - name: Install nix
-      uses: nixbuild/nix-quick-install-action@v28
+      uses: nixbuild/nix-quick-install-action@v29
       with:
         load_nixConfig: false
         nix_conf: |