Update default ci.yaml workflow

Author: agrare

.github/workflows/ci.yaml

@@ -6,5 +6,5 @@ jobs:
   manageiq:
     uses: ManageIQ/manageiq-cross_repo/.github/workflows/manageiq_cross_repo.yaml@master
     with:
-      test-repo: ManageIQ/manageiq@master
+      test-repos: '["ManageIQ/manageiq@master"]'
       repos: ManageIQ/manageiq@master