chore(deps): bump actions/checkout from 4 to 6 (#60)

Author: dependabot[bot]

.github/workflows/agent-validation.yml

@@ -43,7 +43,7 @@ jobs:
     runs-on: ubuntu-latest
     name: Module Integrity
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
         with:
           submodules: recursive
       - uses: actions/setup-node@v4