fix ci deprecations

Author: dbu

.github/workflows/ci.yml

@@ -20,15 +20,15 @@ jobs:
             composer-flags: '--prefer-stable --prefer-lowest'
     steps:
       - name: Check out code into the workspace
-        uses: actions/checkout@v2
+        uses: actions/checkout@v3
       - name: Setup PHP ${{ matrix.php-version }}
         uses: shivammathur/setup-php@v2
         with:
           php-version: ${{ matrix.php-version }}
       - name: Validate composer.json
         run: composer validate --strict --no-check-lock
       - name: Composer cache
-        uses: actions/cache@v2
+        uses: actions/cache@v3
         with:
           path: ${{ env.HOME }}/.composer/cache
           key: ${{ runner.os }}-php-${{ hashFiles('**/composer.lock') }}