Update Microsoft.AspNetCore packages to version 2.3.11 (#1469)

Author: AArnott

Directory.Packages.props

@@ -16,8 +16,8 @@
     <PackageVersion Include="BenchmarkDotNet.Diagnostics.Windows" Version="0.15.8" />
     <PackageVersion Include="MessagePack" Version="$(MessagePackVersion)" />
     <PackageVersion Include="MessagePackAnalyzer" Version="$(MessagePackVersion)" />
-    <PackageVersion Include="Microsoft.AspNetCore.TestHost" Version="2.3.9" />
-    <PackageVersion Include="Microsoft.AspNetCore" Version="2.3.9" />
+    <PackageVersion Include="Microsoft.AspNetCore.TestHost" Version="2.3.11" />
+    <PackageVersion Include="Microsoft.AspNetCore" Version="2.3.11" />
     <PackageVersion Include="Microsoft.Bcl.AsyncInterfaces" Version="10.0.1" />
     <PackageVersion Include="Microsoft.CodeAnalysis.Analyzers" Version="$(RoslynVersion)" />
     <PackageVersion Include="Microsoft.CodeAnalysis.Common" Version="$(RoslynVersion)" />