[Github] Fix unable to trigger action

Author: NoirHare

.github/workflows/nuget-push-lagrange-core.yaml

@@ -5,7 +5,7 @@ on:
     branches:
       - main
     paths:
-      - "Lagrange.Core/Lagrange.Core.sln"
+      - "Lagrange.Core/Lagrange.Core.csproj"
   workflow_dispatch:
 
 jobs: