Don't test downstream SciMLBase yet

Author: AayushSabharwal

.github/workflows/Downstream.yml

@@ -17,7 +17,6 @@ jobs:
         julia-version: [1,1.6]
         os: [ubuntu-latest]
         package:
-          - {user: SciML, repo: SciMLBase.jl, group: Downstream}
           - {user: SciML, repo: RecursiveArrayTools.jl, group: All}
     steps:
       - uses: actions/checkout@v2