chore(deps): bump DeterminateSystems/magic-nix-cache-action (#22130)

Bumps [DeterminateSystems/magic-nix-cache-action](https://github.com/determinatesystems/magic-nix-cache-action) from 13 to 14.
- [Release notes](https://github.com/determinatesystems/magic-nix-cache-action/releases)
- [Commits](565684385b...908b263ff6)

---
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>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

.github/workflows/update-nix-hash.yml

@@ -24,7 +24,7 @@ jobs:
               with:
                   nix_path: nixpkgs=channel:nixos-unstable
             - name: Cache Nix store
-              uses: DeterminateSystems/magic-nix-cache-action@565684385bcd71bad329742eefe8d12f2e765b39 # v13
+              uses: DeterminateSystems/magic-nix-cache-action@908b263ff629f4cc17666315b7fd3ec127c6244d # v14
 
             - name: Update Nix flake hash
               id: update-hash