Bump MSTest.TestAdapter from 2.1.2 to 2.2.1

Bumps [MSTest.TestAdapter](https://github.com/microsoft/testfx) from 2.1.2 to 2.2.1.
- [Release notes](https://github.com/microsoft/testfx/releases)
- [Commits](microsoft/testfx@v2.1.2...v2.2.1)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

src/FluffySpoon.AspNet.EncryptWeMust.Tests/FluffySpoon.AspNet.EncryptWeMust.Tests.csproj

@@ -10,7 +10,7 @@
       <PackageReference Include="Microsoft.AspNetCore.Mvc.Testing" Version="5.0.3" />
       <PackageReference Include="Microsoft.Extensions.DependencyInjection" Version="5.0.1" />
       <PackageReference Include="Microsoft.NET.Test.Sdk" Version="16.9.1" />
-      <PackageReference Include="MSTest.TestAdapter" Version="2.1.2" />
+      <PackageReference Include="MSTest.TestAdapter" Version="2.2.1" />
       <PackageReference Include="MSTest.TestFramework" Version="2.2.1" />
       <PackageReference Include="NSubstitute" Version="4.2.2" />
     </ItemGroup>