Add DiscriminantVariety.jl to the list of downstream apps

Author: sumiya11

.github/workflows/Downstream.yml

@@ -52,6 +52,7 @@ jobs:
           - {user: SciML, repo: StructuralIdentifiability.jl, group: All}
           - {user: alexeyovchinnikov, repo: SIAN-Julia, group: All}
           - {user: sumiya11, repo: ParamPunPam.jl, group: All}
+          - {user: sumiya11, repo: DiscriminantVariety.jl, group: All}
 
     steps:
       - uses: actions/checkout@v4