Use actions/checkout@v6

Use this link to re-run the recipe: https://app.moderne.io/recipes/org.openrewrite.github.ChangeActionVersion?organizationId=QUxML01vZGVybmUvTW9kZXJuZSArIE9wZW5SZXdyaXRl#defaults=W3sidmFsdWUiOiJhY3Rpb25zL2NoZWNrb3V0IiwibmFtZSI6ImFjdGlvbiJ9LHsidmFsdWUiOiJ2NiIsIm5hbWUiOiJ2ZXJzaW9uIn1d

Co-authored-by: Moderne <team@moderne.io>

Author: timtebeek

.github/workflows/ci.yml

@@ -30,7 +30,7 @@ jobs:
       - uses: gradle/actions/setup-gradle@v5
 
       # Run generator
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - name: Generate Markdown
         run: |
           ./gradlew ${{ env.GRADLE_SWITCHES }} run -PlatestVersionsOnly=true