Bump DeterminateSystems/magic-nix-cache-action from 9 to 14

Bumps [DeterminateSystems/magic-nix-cache-action](https://github.com/determinatesystems/magic-nix-cache-action) from 9 to 14.
- [Release notes](https://github.com/determinatesystems/magic-nix-cache-action/releases)
- [Commits](DeterminateSystems/magic-nix-cache-action@v9...v14)

---
updated-dependencies:
- dependency-name: DeterminateSystems/magic-nix-cache-action
  dependency-version: '14'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

.github/workflows/build-cache.yml

@@ -90,7 +90,7 @@ jobs:
         uses: docker/setup-qemu-action@v3
 
       - name: Enable Github Cache for Nix store
-        uses: DeterminateSystems/magic-nix-cache-action@v9
+        uses: DeterminateSystems/magic-nix-cache-action@v14
 
       - name: Setup Attic cache
         uses: ryanccn/attic-action@v0.5.0