Upgrades to stable versions

Author: joncloud

tests/https.Tests/https.Tests.csproj

@@ -17,8 +17,8 @@
       <PrivateAssets>all</PrivateAssets>
       <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
     </PackageReference>
-    <PackageReference Include="Microsoft.Extensions.Hosting" Version="5.0.0-preview.7.20364.11" />
-    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="16.7.0-preview-20200519-01" />
+    <PackageReference Include="Microsoft.Extensions.Hosting" Version="5.0.0" />
+    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="16.8.0" />
     <PackageReference Include="xunit" Version="2.4.1" />
     <PackageReference Include="xunit.runner.visualstudio" Version="2.4.2">
       <PrivateAssets>all</PrivateAssets>