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 `2.1.1`. Obviously, these don't affect downstream dependencies of implementors.

Author: JeremyCaney

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

@@ -7,8 +7,8 @@
 
   <ItemGroup>
     <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" />
+    <PackageReference Include="MSTest.TestAdapter" Version="2.1.1" />
+    <PackageReference Include="MSTest.TestFramework" Version="2.1.1" />
   </ItemGroup>
 
   <ItemGroup>

OnTopic.Tests/OnTopic.Tests.csproj

@@ -32,8 +32,8 @@
       <IncludeAssets>runtime; build; native; contentfiles; analyzers</IncludeAssets>
     </PackageReference>
     <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" />
+    <PackageReference Include="MSTest.TestAdapter" Version="2.1.1" />
+    <PackageReference Include="MSTest.TestFramework" Version="2.1.1" />
   </ItemGroup>
 
   <ItemGroup>