Update actions/checkout action to v6

Author: renovate[bot]

.github/workflows/maven-deploy.yml

@@ -17,7 +17,7 @@ jobs:
 
     steps:
       - name: Checkout code
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
 
       - name: Configure GIT
         run: |

.github/workflows/release-from-tag.yml

@@ -12,7 +12,7 @@ jobs:
     permissions:
       contents: write
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
     - uses: ncipollo/release-action@v1
       with:
         body: 'Changes: https://wcm.io/wcm/ui/clientlibs/changes.html'