Update actions/checkout action to v6

Author: renovate[bot]

.github/workflows/workflow.yml

@@ -17,7 +17,7 @@ jobs:
     env:
       TZ: Europe/Amsterdam
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - uses: actions/setup-node@v6
         with:
           node-version: 24
@@ -31,7 +31,7 @@ jobs:
     needs: [test]
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - uses: actions/setup-node@v6
         with:
           node-version: 24
@@ -51,7 +51,7 @@ jobs:
     env:
       TZ: Europe/Amsterdam
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - uses: actions/setup-node@v6
         with:
           node-version: 24