fix: add missing maxWorkkers parameter to config.base.yml (#11833)

Author: jhockett

.circleci/config.base.yml

@@ -384,7 +384,7 @@ jobs:
           command: |
             source .circleci/local_publish_helpers.sh
             verifyPkgCli
-            
+
   amplify_sudo_install_test:
     <<: *defaults
     steps:
@@ -472,7 +472,7 @@ jobs:
             source .circleci/local_publish_helpers.sh
             changeNpmGlobalPath
             cd packages/amplify-migration-tests
-            retry yarn run migration_v5.2.0 --no-cache --maxWorkers= $TEST_SUITE
+            retry yarn run migration_v5.2.0 --no-cache --maxWorkers=3 $TEST_SUITE
           no_output_timeout: 65m
       - run: *scan_e2e_test_artifacts
       - store_test_results: