Update actions/checkout action to v7 (#142)

Author: renovate[bot]

.github/workflows/php.yml

@@ -12,7 +12,7 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-    - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6
+    - uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7
 
     - name: Setup PHP Action
       uses: shivammathur/setup-php@f3e473d116dcccaddc5834248c87452386958240 # 2.37.2