ci: do not run Neuroblox in downstream CI

Author: AayushSabharwal

.github/workflows/Downstream.yml

@@ -46,8 +46,6 @@ jobs:
           - {user: SciML, repo: MethodOfLines.jl, group: DAE}
           - {user: SciML, repo: ModelingToolkitNeuralNets.jl, group: All}
           - {user: SciML, repo: SciMLSensitivity.jl, group: Core8}
-
-          - {user: Neuroblox, repo: Neuroblox.jl, group: All}
     steps:
       - uses: actions/checkout@v6
       - uses: julia-actions/setup-julia@v2