Updated Microsoft Unit Test libraries

Updated the Microsoft Unit Test related libraries to their latest versions. This includes migrating both `MSTest.TestFramework` and `MSTest.TestAdapter` to `2.1.0`, as well as `Microsoft.NET.Test.Sdk`, which is part of the **Visual Studio** integration, up to `16.5.0`. Obviously, these don't affect downstream dependencies of implementors.

Author: JeremyCaney

OnTopic.AspNetCore.Mvc.Tests/OnTopic.AspNetCore.Mvc.Tests.csproj

@@ -6,9 +6,9 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="16.2.0" />
-    <PackageReference Include="MSTest.TestAdapter" Version="2.0.0" />
-    <PackageReference Include="MSTest.TestFramework" Version="2.0.0" />
+    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="16.5.0" />
+    <PackageReference Include="MSTest.TestAdapter" Version="2.1.0" />
+    <PackageReference Include="MSTest.TestFramework" Version="2.1.0" />
   </ItemGroup>
 
   <ItemGroup>

OnTopic.Tests/OnTopic.Tests.csproj

@@ -31,9 +31,9 @@
       <PrivateAssets>all</PrivateAssets>
       <IncludeAssets>runtime; build; native; contentfiles; analyzers</IncludeAssets>
     </PackageReference>
-    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="16.2.0" />
-    <PackageReference Include="MSTest.TestAdapter" Version="2.0.0" />
-    <PackageReference Include="MSTest.TestFramework" Version="2.0.0" />
+    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="16.5.0" />
+    <PackageReference Include="MSTest.TestAdapter" Version="2.1.0" />
+    <PackageReference Include="MSTest.TestFramework" Version="2.1.0" />
   </ItemGroup>
 
   <ItemGroup>