Update actions/checkout action to v6

Author: renovate[bot]

.github/workflows/pages-generate-from-docs-dir.yml

@@ -46,7 +46,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
         with:
           lfs: ${{ inputs.lfs-checkout }}
 
@@ -63,7 +63,7 @@ jobs:
           ##   schemas (content = src/main/resources/schemas/*)
 
       - name: Checkout blueprints
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
         with:
           repository: riege/github-pages-build
           sparse-checkout: pages-layout

.github/workflows/verify.yml

@@ -15,7 +15,7 @@ jobs:
       contents: read
       checks: write
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
 
       - name: Setup Java and Dependency Caching
         uses: actions/setup-java@v5