ci(deps): bump actions/cache from 4 to 5 (#3290)

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](https://github.com/actions/cache/compare/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>

.github/workflows/ci-build-starters-matrix.yml

@@ -72,7 +72,7 @@ jobs:
                   echo "key=${{ runner.os }}-hugo-resources-${{ matrix.starter.name }}-$HASH" >> $GITHUB_OUTPUT
 
             - name: Cache Hugo resources (starter)
-              uses: actions/cache@v4
+              uses: actions/cache@v5
               with:
                   path: ${{ matrix.starter.path }}/resources/
                   key: ${{ steps.reskey.outputs.key }}
@@ -147,7 +147,7 @@ jobs:
               run: pnpm install --no-frozen-lockfile
 
             - name: Cache Hugo resources (test)
-              uses: actions/cache@v4
+              uses: actions/cache@v5
               with:
                   path: test/resources/
                   key: ${{ runner.os }}-hugo-resources-test-${{ hashFiles('test/assets/**/*', 'test/config.yaml', 'test/package.json') }}
@@ -189,7 +189,7 @@ jobs:
               run: pnpm install --no-frozen-lockfile
 
             - name: Cache Hugo resources (template)
-              uses: actions/cache@v4
+              uses: actions/cache@v5
               with:
                   path: templates/academic-cv/resources/
                   key: ${{ runner.os }}-hugo-resources-academic-latest-${{ hashFiles('templates/academic-cv/assets/**/*', 'templates/academic-cv/config/**/*', 'templates/academic-cv/hugoblox.yaml', 'templates/academic-cv/package.json') }}
@@ -244,7 +244,7 @@ jobs:
                   echo "version=$VERSION" >> $GITHUB_OUTPUT
 
             - name: Cache Hugo resources (test - min)
-              uses: actions/cache@v4
+              uses: actions/cache@v5
               with:
                   path: test/resources/
                   key: ${{ runner.os }}-hugo-resources-test-min-${{ steps.min.outputs.version }}-${{ hashFiles('test/assets/**/*', 'test/config.yaml', 'test/package.json') }}