dependency: Update actions/checkout action to v6

Author: renovate[bot]

.github/workflows/gradle.yml

@@ -62,7 +62,7 @@ jobs:
           echo "comment-id=${{ steps.find-comment.outputs.comment-id != '' && steps.find-comment.outputs.comment-id || steps.create-comment.outputs.comment-id }}" >> $GITHUB_OUTPUT
 
       - name: Checkout
-        uses: actions/checkout@v5.0.1
+        uses: actions/checkout@v6.0.0
 
       - name: Set up JDK ${{ matrix.java }}
         uses: actions/[email protected]

.github/workflows/publish.yml

@@ -9,7 +9,7 @@ jobs:
     environment: deployment
     steps:
       - name: Checkout
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
 
       - name: Set up JDK
         uses: actions/setup-java@v5