Update sync.yml

Author: oliver-zhang

.github/workflows/sync.yml

@@ -37,7 +37,7 @@ jobs:
       with:
         target_sync_branch: main
         # REQUIRED 'target_repo_token' exactly like this!
-        target_repo_token: ${{ secrets.GITHUB_TOKEN }}
+        target_repo_token: ${{ secrets.MY_SECRET }}
         upstream_sync_branch: main
         upstream_sync_repo: open-telemetry/opentelemetry-java-instrumentation
         upstream_repo_access_token: ${{ secrets.UPSTREAM_REPO_SECRET }}