build(deps): bump namespacelabs/nscloud-cache-action

Bumps [namespacelabs/nscloud-cache-action](https://github.com/namespacelabs/nscloud-cache-action) from 1.2.21 to 1.4.0.
- [Release notes](https://github.com/namespacelabs/nscloud-cache-action/releases)
- [Commits](namespacelabs/nscloud-cache-action@v1.2.21...v1.4.0)

---
updated-dependencies:
- dependency-name: namespacelabs/nscloud-cache-action
  dependency-version: 1.4.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

.github/workflows/test.yml

@@ -34,7 +34,7 @@ jobs:
       uses: actions/checkout@v6
 
     - name: Setup Cache
-      uses: namespacelabs/nscloud-cache-action@v1.2.21
+      uses: namespacelabs/nscloud-cache-action@v1.4.0
       with:
         path: |
           /nix
@@ -66,7 +66,7 @@ jobs:
       uses: actions/checkout@v6
 
     - name: Setup Cache
-      uses: namespacelabs/nscloud-cache-action@v1.2.21
+      uses: namespacelabs/nscloud-cache-action@v1.4.0
       with:
         path: |
           /nix