chore(gha): bump actions/checkout from 5 to 6 (#634)

Author: dependabot[bot]

.github/workflows/check-projects.yml

@@ -22,7 +22,7 @@ jobs:
   build_bpmn-visualization_development_npm_package:
     runs-on: ubuntu-24.04
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
         with:
           repository: 'process-analytics/bpmn-visualization-js'
           # to test a specific feature under development, uncomment the following line and use the related branch
@@ -67,7 +67,7 @@ jobs:
         with:
           name: bpmn-visualization-npm-package
           path: ${{github.workspace}}/../bpmn-visualization-npm-package
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - name: Setup node
         uses: actions/setup-node@v6
         with:

.github/workflows/update_bpmn_visualization_version.yml

@@ -51,7 +51,7 @@ jobs:
       BUILD_DEMO_REPO: ${{ github.event.client_payload.build_demo_repo || github.event.inputs.build_demo_repo }}
       IIFE_BUNDLE_INTEGRITY: ${{needs.compute-iife-bundle-integrity.outputs.integrity-value}}
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - name: Update bpmn-visualization version in all examples
         run: ./scripts/update-lib-version.bash ${{ env.VERSION }} ${{ env.IIFE_BUNDLE_INTEGRITY }}
       - name: Delete old Load and Navigation demo