Add NoWarns

Directory.Build.props

@@ -53,6 +53,10 @@
     <WarningsNotAsErrors>$(WarningsNotAsErrors);CS1591</WarningsNotAsErrors>
     <!-- xUnit1004 = warns about skipped tests. Make this a non-fatal build warning. -->
     <WarningsNotAsErrors>$(WarningsNotAsErrors);xUnit1004</WarningsNotAsErrors>
+    <!-- Working around https://github.com/NuGet/Home/issues/8467 -->
+    <NoWarn>$(NoWarn);NU5131</NoWarn>
+    <!-- Needed until we resolve https://github.com/aspnet/AspNetCore-Internal/issues/3103 -->
+    <NoWarn>$(NoWarn);NU5048</NoWarn>
   </PropertyGroup>
 
   <!-- Source code settings -->