Fixup feeds (#43027)

Co-authored-by: Matt Mitchell <mmitche@microsoft.com>

dir.props

@@ -72,7 +72,7 @@
     <!-- Including buildtools to pull in TestSuite packages and repackaged xunit dependencies-->
     <DotnetSourceList Include="https:%2F%2Fpkgs.dev.azure.com/dnceng/public/_packaging/myget-legacy/nuget/v3/index.json" />
     <DotnetSourceList Include="https:%2F%2Fdotnetmygetlegacy.blob.core.windows.net/dotnet-core/index.json" />
-    <DotnetSourceList Include="https:%2F%2Fapi.nuget.org/v3/index.json" />
+    <DotnetSourceList Include="https:%2F%2Fpkgs.dev.azure.com/dnceng/public/_packaging/dotnet-public/nuget/v3/index.json" />
   </ItemGroup>
 
   <PropertyGroup>

pkg/test/testPackages.proj

@@ -13,7 +13,7 @@
 
     <!-- restrict restore sources to the current build and publicly shipped packages -->
     <RestoreSource Include="$(PackageOutputPath)" />
-    <RestoreSource Include="https:%2F%2Fapi.nuget.org/v3/index.json" />
+    <RestoreSource Include="https:%2F%2Fpkgs.dev.azure.com/dnceng/public/_packaging/dotnet-public/nuget/v3/index.json" />
 
     <!-- needed for SQLClient's SNI packages -->
     <RestoreSource Include="https:%2F%2Fdotnetmygetlegacy.blob.core.windows.net/dotnet-core/index.json" />

src/NuGet.config

@@ -6,7 +6,7 @@
     <clear/>
     <add key="myget.org dotnet-buildtools" value="https://pkgs.dev.azure.com/dnceng/public/_packaging/myget-legacy/nuget/v3/index.json" />
     <add key="myget.org dotnet-core" value="https://dotnetmygetlegacy.blob.core.windows.net/dotnet-core/index.json" />
-    <add key="nuget.org" value="https://api.nuget.org/v3/index.json" />
+    <add key="dotnet-public" value="https://pkgs.dev.azure.com/dnceng/public/_packaging/dotnet-public/nuget/v3/index.json" />
   </packageSources>
   <config>
     <add key="repositoryPath" value="..\packages" />