Update actions/checkout action to v6

Author: renovate[bot]

.github/workflows/maven-build.yml

@@ -21,7 +21,7 @@ jobs:
 
     steps:
       - name: Checkout code
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
 
       - name: Setup JDK
         uses: actions/setup-java@v5

.github/workflows/maven-deploy.yml

@@ -15,7 +15,7 @@ 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://devops.wcm.io/maven/plugins/eclipse-maven-plugin/changes.html'