build(deps): bump actions/cache from 4 to 5 (#154)

Bumps [actions/cache](https://github.com/actions/cache) from 4 to 5.
- [Release notes](https://github.com/actions/cache/releases)
- [Changelog](https://github.com/actions/cache/blob/main/RELEASES.md)
- [Commits](actions/cache@v4...v5)

---
updated-dependencies:
- dependency-name: actions/cache
  dependency-version: '5'
  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>

Author: dependabot[bot]

.github/workflows/check-broken-links-schedule.yaml

@@ -19,7 +19,7 @@ jobs:
           fetch-depth: 0
 
       - name: Restore lychee cache
-        uses: actions/cache@v4
+        uses: actions/cache@v5
         with:
           path: .lycheecache
           key: cache-lychee-scheduled-${{ github.sha }}

.github/workflows/check-broken-links.yaml

@@ -22,7 +22,7 @@ jobs:
 
       # Optimize caching strategy to reduce API requests
       - name: Restore lychee cache
-        uses: actions/cache@v4
+        uses: actions/cache@v5
         with:
           path: .lycheecache
           key: cache-lychee-${{ github.sha }}

.github/workflows/publish.yml

@@ -40,7 +40,7 @@ jobs:
 
       # Cache Hugo's module/remote cache
       - name: Cache Hugo modules
-        uses: actions/cache@v4
+        uses: actions/cache@v5
         with:
           path: /root/.cache/hugo
           key: ${{ runner.os }}-hugo-${{ hashFiles('**/go.mod', '**/go.sum') }}