Bump actions/cache from 3 to 4

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>

.github/workflows/ci.yml

@@ -35,7 +35,7 @@ jobs:
         working-directory: assets/
         run: yarn
       - name: ♻️ Cache Hugo modules
-        uses: actions/cache@v3
+        uses: actions/cache@v4
         with:
           path: ~/.cache/hugo_cache
           key: ${{ runner.os }}-hugo-modules-${{ hashFiles('**/go.sum') }}
@@ -45,7 +45,7 @@ jobs:
         env:
           HUGO_PARAMS_githubToken: ${{ secrets.GITHUB_TOKEN }}
       - name: ♻️ Cache link checker requests
-        uses: actions/cache@v3
+        uses: actions/cache@v4
         with:
           path: .lycheecache
           key: link-checker-${{ github.sha }}