feat(presets/monorepos): Add additional dotnet resources (renovatebot#41123)

Add additional dotnet resources to monorepo.json

Microsoft did probably something strange. Only after adding this 3 urls, grouping of dotnet updates worked again

Author: stefannikolei

lib/data/monorepo.json

@@ -283,6 +283,9 @@
     "docusaurus": "https://github.com/facebook/docusaurus",
     "dot-swashbuckle": "https://github.com/Havunen/DotSwashbuckle",
     "dotnet": [
+      "https://asp.net/",
+      "https://docs.microsoft.com/ef/core/",
+      "https://dot.net/",
       "https://github.com/dotnet/aspnetcore",
       "https://github.com/dotnet/dotnet",
       "https://github.com/dotnet/efcore",