Add downstream test for BoundaryValueDiffEq.jl

Author: avik-pal

.github/workflows/Downstream.yml

@@ -19,6 +19,7 @@ jobs:
           - {user: SciML, repo: OrdinaryDiffEq.jl, group: InterfaceII}
           - {user: SciML, repo: ModelingToolkit.jl, group: All}
           - {user: SciML, repo: SciMLSensitivity.jl, group: Core1}
+          - {user: SciML, repo: BoundaryValueDiffEq.jl, group: All}
 
     steps:
       - uses: actions/checkout@v4