♻️ Bump actions/cache from 3 to 4 (#23)

Bumps [actions/cache](https://github.com/actions/cache) from 3 to 4.
- [Release notes](https://github.com/actions/cache/releases)
- [Changelog](https://github.com/actions/cache/blob/main/RELEASES.md)
- [Commits](actions/cache@v3...v4)

---
updated-dependencies:
- dependency-name: actions/cache
  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/publish.yml

@@ -43,7 +43,7 @@ jobs:
 
       - name: Restore cached repository 📦
         id: restore
-        uses: actions/cache/restore@v3
+        uses: actions/cache/restore@v4
         with:
           path: texlive/
           key: rsync-TL${{ steps.get-year.outputs.year }}-${{ github.sha }}
@@ -71,7 +71,7 @@ jobs:
 
       - name: Save repository to cache 💾
         if: ${{ ! startsWith(github.ref, 'refs/tags/v') }}
-        uses: actions/cache/save@v3
+        uses: actions/cache/save@v4
         with:
           path: texlive/
           key: rsync-TL${{ steps.tl-release.outputs.number }}-${{ github.sha }}