Build(deps): Bump DeterminateSystems/magic-nix-cache-action from 2 to 13

Bumps [DeterminateSystems/magic-nix-cache-action](https://github.com/determinatesystems/magic-nix-cache-action) from 2 to 13.
- [Release notes](https://github.com/determinatesystems/magic-nix-cache-action/releases)
- [Commits](DeterminateSystems/magic-nix-cache-action@v2...v13)

---
updated-dependencies:
- dependency-name: DeterminateSystems/magic-nix-cache-action
  dependency-version: '13'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

.github/workflows/test-docs-scripts.yml

@@ -144,7 +144,7 @@ jobs:
         uses: DeterminateSystems/nix-installer-action@v4
 
       - name: Setup Nix Cache
-        uses: DeterminateSystems/magic-nix-cache-action@v2
+        uses: DeterminateSystems/magic-nix-cache-action@v13
 
       - name: Test nix develop succeeds
         run: |