Bump actions/cache from 5.0.2 to 5.0.3

Bumps [actions/cache](https://github.com/actions/cache) from 5.0.2 to 5.0.3.
- [Release notes](https://github.com/actions/cache/releases)
- [Changelog](https://github.com/actions/cache/blob/main/RELEASES.md)
- [Commits](actions/cache@8b402f5...cdf6c1f)

---
updated-dependencies:
- dependency-name: actions/cache
  dependency-version: 5.0.3
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

Author: dependabot[bot]

.github/workflows/markdown.yml

@@ -18,7 +18,7 @@ jobs:
       with:
         persist-credentials: false
     - name: Restore lychee cache
-      uses: actions/cache@8b402f58fbc84540c8b491a91e594a4576fec3d7 # v5.0.2
+      uses: actions/cache@cdf6c1fa76f9f475f3d7449005a359c84ca0f306 # v5.0.3
       with:
          path: .lycheecache
          key: cache-lychee-${{ github.sha }}