Update Microsoft.AspNetCore.TestHost requirement (#243)

Updates the requirements on [Microsoft.AspNetCore.TestHost](https://github.com/dotnet/aspnetcore) to permit the latest version.
- [Release notes](https://github.com/dotnet/aspnetcore/releases)
- [Commits](https://github.com/dotnet/aspnetcore/commits)

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

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

FeatureFlags/FeatureFlags.Tests/FeatureFlags.Tests.csproj

@@ -27,7 +27,7 @@
     <PackageReference Include="Microsoft.AspNetCore.HttpsPolicy" Version="2.2.0" />
     <PackageReference Include="Microsoft.AspNetCore.Mvc" Version="2.2.0" />
     <PackageReference Include="Microsoft.AspNetCore.Mvc.Core" Version="2.2.5" />
-    <PackageReference Include="Microsoft.AspNetCore.TestHost" Version="5.0.1.*" />
+    <PackageReference Include="Microsoft.AspNetCore.TestHost" Version="5.0.2.*" />
     <PackageReference Include="Microsoft.Extensions.Configuration" Version="5.0.0.*" />
     <PackageReference Include="Microsoft.Extensions.Configuration.Json" Version="5.0.0.*" />
     <PackageReference Include="Microsoft.Extensions.Configuration.UserSecrets" Version="5.0.0.*" />