Workflows patch.

Bump actions/checkout from v2 to v3.

Author: Maikuolan

.github/workflows/core.yml

@@ -13,7 +13,7 @@ jobs:
   name: PHP ${{ matrix.php-versions }} on ${{ matrix.operating-system }}
   steps:
   - name: Checkout
-    uses: actions/checkout@v2
+    uses: actions/checkout@v3
 
   - name: Set up PHP
     uses: shivammathur/setup-php@v2

.github/workflows/php-cs-fixer.yml

@@ -13,7 +13,7 @@ jobs:
   name: PHP ${{ matrix.php-versions }} on ${{ matrix.operating-system }}
   steps:
   - name: Checkout
-    uses: actions/checkout@v2
+    uses: actions/checkout@v3
 
   - name: Set up PHP
     uses: shivammathur/setup-php@v2