Bump MSTest.TestFramework from 2.2.1 to 2.2.3 (#29)

Bumps [MSTest.TestFramework](https://github.com/microsoft/testfx) from 2.2.1 to 2.2.3.
- [Release notes](https://github.com/microsoft/testfx/releases)
- [Commits](microsoft/testfx@v2.2.1...v2.2.3)

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UnitTest/UnitTest.csproj

@@ -10,7 +10,7 @@
   <ItemGroup>
     <PackageReference Include="Microsoft.NET.Test.Sdk" Version="16.9.1" />
     <PackageReference Include="MSTest.TestAdapter" Version="2.2.1" />
-    <PackageReference Include="MSTest.TestFramework" Version="2.2.1" />
+    <PackageReference Include="MSTest.TestFramework" Version="2.2.3" />
     <PackageReference Include="coverlet.collector" Version="3.0.3" />
   </ItemGroup>