chore(deps): ⬆️ bump actions/cache action to v4 (#705)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

.github/workflows/ci.yml

@@ -21,7 +21,7 @@ jobs:
       id: composer-cache
       run: echo "::set-output name=dir::$(composer config cache-files-dir)"
 
-    - uses: actions/cache@v3
+    - uses: actions/cache@v4
       with:
         path: ${{ steps.composer-cache.outputs.dir }}
         key: ${{ runner.os }}-composer-${{ hashFiles('**/composer.lock') }}