Upgrade actions/checkout from v6 to v7 (#128)

Author: sy-records

.github/workflows/phpstan.yml

@@ -24,7 +24,7 @@ jobs:
       fail-fast: false
     steps:
       - name: Checkout
-        uses: actions/checkout@v6
+        uses: actions/checkout@v7
 
       - name: Setup PHP
         uses: shivammathur/setup-php@v2

.github/workflows/test.yml

@@ -45,7 +45,7 @@ jobs:
       SWOOLE_VERSION: ${{ matrix.swoole-version }}
     steps:
       - name: Checkout
-        uses: actions/checkout@v6
+        uses: actions/checkout@v7
 
       - name: Setup PHP
         uses: shivammathur/setup-php@v2