Bump GraphQL to 8.0.0 (#1146)

Author: Shane32

Directory.Build.props

@@ -32,8 +32,7 @@
     <RootNamespace>GraphQL.Server.$(MSBuildProjectName)</RootNamespace>
     <PackageId>GraphQL.Server.$(MSBuildProjectName)</PackageId>
 
-    <!--<GraphQLVersion>[8.0.0,9.0.0)</GraphQLVersion>-->
-    <GraphQLVersion>8.0.0-preview-1053</GraphQLVersion>
+    <GraphQLVersion>[8.0.0,9.0.0)</GraphQLVersion>
 
     <SignAssembly>true</SignAssembly>
     <_FriendAssembliesPublicKey>PublicKey=0024000004800000940000000602000000240000525341310004000001000100352162dbf27be78fc45136884b8f324aa9f1dfc928c96c24704bf1df1a8779b2f26c760ed8321eca5b95ea6bd9bb60cd025b300f73bd1f4ae1ee6e281f85c527fa013ab5cb2c3fc7a1cbef7f9bf0c9014152e6a21f6e0ac6a371f8b45c6d7139c9119df9eeecf1cf59063545bb7c07437b1bc12be2c57d108d72d6c27176fbb8</_FriendAssembliesPublicKey>