Update actions/checkout action to v5

| datasource  | package          | from | to |
| ----------- | ---------------- | ---- | -- |
| github-tags | actions/checkout | v4   | v5 |

Author: renovate[bot]

.github/workflows/continuous-integration.yaml

@@ -31,7 +31,7 @@ jobs:
           - "ubuntu-latest"
     steps:
       - name: "checkout"
-        uses: "actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683" # v4
+        uses: "actions/checkout@08c6903cd8c0fde910a37f88322edcfb5dd907a8" # v5
 
       - name: "install php"
         uses: "shivammathur/setup-php@2.35.3"
@@ -65,7 +65,7 @@ jobs:
 
     steps:
       - name: "checkout"
-        uses: "actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683" # v4
+        uses: "actions/checkout@08c6903cd8c0fde910a37f88322edcfb5dd907a8" # v5
 
       - name: "install php"
         uses: "shivammathur/setup-php@2.35.3"
@@ -101,7 +101,7 @@ jobs:
 
     steps:
       - name: "checkout"
-        uses: "actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683" # v4
+        uses: "actions/checkout@08c6903cd8c0fde910a37f88322edcfb5dd907a8" # v5
 
       - name: "install PHP"
         uses: "shivammathur/setup-php@2.35.3"