Updating ASP.NET Core references to 2.2.6

Author: fabiocav

src/WebJobs.Script.WebHost/WebJobs.Script.WebHost.csproj

@@ -51,7 +51,7 @@
   </ItemGroup>
 
   <ItemGroup>
-    <PackageReference Include="Microsoft.AspNetCore.App" Version="2.2.5" />
+    <PackageReference Include="Microsoft.AspNetCore.App" Version="2.2.6" />
     <PackageReference Include="Microsoft.Azure.AppService.Proxy.Client" Version="2.0.8100001-0126c21e" />
     <PackageReference Include="Microsoft.Azure.Services.AppAuthentication" Version="1.0.3" />
     <PackageReference Include="Microsoft.Azure.WebJobs.Host.Storage" Version="3.0.11" />