Bump actions/cache from 4 to 5 (#980)

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/ci.yml

@@ -98,7 +98,7 @@ jobs:
         run: echo "date=$(date +'%Y-%m')" >> $GITHUB_OUTPUT
 
       - name: Cache composer dependencies
-        uses: actions/cache@v4
+        uses: actions/cache@v5
         with:
           path: ${{ steps.composer-cache.outputs.dir }}
           key: ${{ runner.os }}-composer-${{ steps.key-date.outputs.date }}-${{ hashFiles('composer.json') }}-${{ matrix.prefer-lowest }}
@@ -176,7 +176,7 @@ jobs:
         key: ${{ steps.key-date.outputs.date }}
 
     - name: Cache PHP extensions
-      uses: actions/cache@v4
+      uses: actions/cache@v5
       with:
         path: ${{ steps.php-ext-cache.outputs.dir }}
         key: ${{ runner.os }}-php-ext-${{ steps.php-ext-cache.outputs.key }}
@@ -204,7 +204,7 @@ jobs:
       run: echo "dir=$(composer config cache-files-dir)" >> $GITHUB_OUTPUT
 
     - name: Cache composer dependencies
-      uses: actions/cache@v4
+      uses: actions/cache@v5
       with:
         path: ${{ steps.composer-cache.outputs.dir }}
         key: ${{ runner.os }}-composer-${{ steps.key-date.outputs.date }}-${{ hashFiles('composer.json') }}-${{ matrix.prefer-lowest }}