chore(deps): update actions/checkout action to v6

Author: renovate[bot]

.github/workflows/workflow.yaml

@@ -5,7 +5,7 @@ jobs:
     build:
         runs-on: ubuntu-latest
         steps:
-            -   uses: actions/checkout@v4
+            -   uses: actions/checkout@v6
 
             -   name: Setup JDK
                 uses: actions/setup-java@v4