Update GitHub Actions workflow permissions and token

Author: rbradley813

.github/workflows/merge-hook-test.yaml

@@ -6,6 +6,9 @@ on:
     branches:
       - main
 
+permissions:
+  contents: write 
+
 jobs:
   update-version:
     # Only run if the PR was actually merged (not just closed)
@@ -17,7 +20,7 @@ jobs:
         uses: actions/checkout@v4
         with:
           ref: main
-          token: ${{ secrets.IKMDEVOPS_PAT_TOKEN }}
+          token: ${{ secrets.GITHUB_TOKEN }}
 
       - name: Set up JDK
         uses: actions/setup-java@v4