fix nuget error

Author: enricosada

tests/service/FSharp.Compiler.Service.Tests.fsproj

@@ -17,6 +17,7 @@
     <OutputPath>..\..\bin\$(TargetFrameworkVersion)\</OutputPath>
     <Tailcalls>true</Tailcalls>
     <TargetFSharpCoreVersion>4.4.0.0</TargetFSharpCoreVersion>
+    <ResolveNuGetPackages>false</ResolveNuGetPackages>
   </PropertyGroup>
   <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Debug|AnyCPU' ">
     <DebugSymbols>true</DebugSymbols>