ci(github-action)!: Update actions/checkout action (v4 → v6)

| datasource  | package          | from | to |
| ----------- | ---------------- | ---- | -- |
| github-tags | actions/checkout | v4   | v6 |

Author: erhardt-consulting-bot

.github/workflows/test.yaml

@@ -11,7 +11,7 @@ jobs:
 
     steps:
     - name: Checkout code
-      uses: actions/checkout@34e114876b0b11c390a56381ad16ebd13914f8d5 # v4
+      uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6
 
     - name: Set up Python 3.11
       uses: actions/setup-python@a26af69be951a213d495a4c3e4e4022e16d87065 # v5