Bump GraphQL version

Author: ganhammar

Directory.Build.props

@@ -5,8 +5,8 @@
     </PropertyGroup>
 
     <PropertyGroup>
-        <GraphQLVersion>3.0.0-preview-1490</GraphQLVersion>
-        <GraphQLServerVersion>3.5.0-alpha0046</GraphQLServerVersion>
+        <GraphQLVersion>3.0.0</GraphQLVersion>
+        <GraphQLServerVersion>3.5.0-alpha0073</GraphQLServerVersion>
         <MicrosoftAspNetCoreHttpAbstractionsVersion>2.2.0</MicrosoftAspNetCoreHttpAbstractionsVersion>
         <MicrosoftAspNetCoreHttpFeaturesVersion>3.1.2</MicrosoftAspNetCoreHttpFeaturesVersion>
         <MicrosoftExtensionsLoggingVersion>3.1.2</MicrosoftExtensionsLoggingVersion>

src/GraphQL.Upload.AspNetCore/GraphQLUploadRequest.cs

@@ -1,7 +1,6 @@
 using System.Collections.Generic;
 
 #if IS_NET_CORE_3_ONWARDS_TARGET
-using System.Collections.Generic;
 using System.Text.Json.Serialization;
 #else
 using Newtonsoft.Json;