github-actions(deps): bump actions/checkout from 5 to 6 (#197)

Author: dependabot[bot]

.github/workflows/ci.yaml

@@ -14,7 +14,7 @@ jobs:
 
         steps:
             - name: 'Checkout code'
-              uses: actions/checkout@v5
+              uses: actions/checkout@v6
 
             - name: 'Install PHP'
               uses: shivammathur/setup-php@v2
@@ -41,7 +41,7 @@ jobs:
 
         steps:
             - name: 'Checkout code'
-              uses: actions/checkout@v5
+              uses: actions/checkout@v6
 
             - name: 'Install PHP'
               uses: shivammathur/setup-php@v2