Update actions/checkout action to v6.0.3

Author: renovate[bot]

.github/workflows/publish.yml

@@ -10,7 +10,7 @@ jobs:
   build:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v6.0.2
+      - uses: actions/checkout@v6.0.3
       - uses: gradle/actions/wrapper-validation@v6
       - name: Set up JDK 17
         uses: actions/setup-java@v5.2.0