Upgrade actions/checkout to version 5

Author: brotkrueml

.github/workflows/ci.yml

@@ -30,7 +30,7 @@ jobs:
           - '8.4'
     steps:
       - name: Check out repository
-        uses: actions/checkout@v4
+        uses: actions/checkout@v5
         with:
           fetch-depth: 1
       - name: Setup PHP version
@@ -63,7 +63,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Check out repository
-        uses: actions/checkout@v4
+        uses: actions/checkout@v5
       - name: Setup PHP version
         uses: shivammathur/setup-php@v2
         with: