Update Downstream.yml

add downstream test for sparsedifftools.jl

JuliaDiff/SparseDiffTools.jl#240 places all scimlops related tests in group "InterfaceI"

Author: vpuri3

.github/workflows/Downstream.yml

@@ -19,6 +19,7 @@ jobs:
           - {user: SciML, repo: SciMLBase.jl, group: InterfaceII}
           - {user: SciML, repo: DiffEqBase.jl, group: InterfaceII}
           - {user: SciML, repo: LinearSolve.jl, group: InterfaceII}
+          - {user: JuliaDiff, repo: SparseDiffTools.jl, group: InterfaceI}
 
     steps:
       - uses: actions/checkout@v3