Update Downstream.yml

Author: ChrisRackauckas

.github/workflows/Downstream.yml

@@ -13,7 +13,7 @@ jobs:
       GROUP: ${{ matrix.package.group }}
     strategy:
       matrix:
-        julia-version: [1,1.6]
+        julia-version: [1]
         os: [ubuntu-latest]
         package:
           - {user: SciML, repo: OrdinaryDiffEq.jl, group: InterfaceII}