Merge pull request #18 from php5friends/dependabot/github_actions/actions/checkout-3

Bump actions/checkout from 2 to 3

Author: nanasess

.github/workflows/ci.yml

@@ -23,7 +23,7 @@ jobs:
         php: [ '5.3', '5.4', '5.5', '5.6', '7.1', '7.2', '7.3', '7.4', '8.0', '8.1' ]
         dependencies: [ 'lowest', 'highest' ]
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v3
       - uses: shivammathur/setup-php@v2
         with:
           php-version: ${{ matrix.php }}