fix: out-of-scope variable in catch block

Author: nborges-aws

.github/workflows/integration-testing.yml

@@ -75,8 +75,8 @@ jobs:
         with:
           result-encoding: string
           script: |
+            let username;
             try {
-              let username;
               if (context.payload.pull_request) {
                 username = context.payload.pull_request.user.login;
               } else {