Remove nuget feeds, leaving only nuget.org

Author: roji

NuGet.config

@@ -1,25 +1,13 @@
 <?xml version="1.0" encoding="utf-8"?>
 <configuration>
+
     <packageSources>
-        <add key="dotnet10" value="https://pkgs.dev.azure.com/dnceng/public/_packaging/dotnet10/nuget/v3/index.json" />
-        <add key="dotnet-eng" value="https://pkgs.dev.azure.com/dnceng/public/_packaging/dotnet-eng/nuget/v3/index.json" />
-        <add key="npgsql-vnext" value="https://www.myget.org/F/npgsql-vnext/api/v3/index.json" />
         <add key="nuget.org" value="https://api.nuget.org/v3/index.json" />
     </packageSources>
 
     <packageSourceMapping>
         <packageSource key="nuget.org">
             <package pattern="*" />
-            <!-- Our npgsql-vnext feed doesn't necessarily contain the last preview (package retention rules...), so we take it from nuget.org -->
-            <package pattern="Npgsql" />
-            <package pattern="Npgsql.*" />
-        </packageSource>
-        <packageSource key="npgsql-vnext">
-            <package pattern="Npgsql" />
-            <package pattern="Npgsql.*" />
-        </packageSource>
-        <packageSource key="dotnet10">
-            <package pattern="*" />
         </packageSource>
     </packageSourceMapping>