Switch to netcoreapp2.1 (2.2 not supported by DevOps anymore)

Author: ganhammar

tests/GraphQL.Upload.AspNetCore.Tests/GraphQL.Upload.AspNetCore.Tests.csproj

@@ -1,7 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
-    <TargetFrameworks>netcoreapp2.2;netcoreapp3.1</TargetFrameworks>
+    <TargetFrameworks>netcoreapp2.1;netcoreapp3.1</TargetFrameworks>
 
     <IsPackable>false</IsPackable>
   </PropertyGroup>