chore(deps): update actions/cache action to v6

Author: renovate[bot]

.github/workflows/verify.yml

@@ -53,7 +53,7 @@ jobs:
         run: echo "dir=$(composer config cache-files-dir)" >> "$GITHUB_OUTPUT"
 
       - name: Cache Composer dependencies
-        uses: actions/cache@v5
+        uses: actions/cache@v6
         with:
           path: ${{ steps.composer-cache.outputs.dir }}
           key: ${{ runner.os }}-php${{ matrix.php-version }}-composer-${{ hashFiles('**/composer.lock') }}