For v4.8, restrict parser to pre-8 versions (graphql-dotnet#3040)

Author: Shane32

src/GraphQL/GraphQL.csproj

@@ -10,7 +10,7 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="GraphQL-Parser" Version="7.2.0" />
+    <PackageReference Include="GraphQL-Parser" Version="[7.2.0,8.0.0)" />
     <PackageReference Include="Microsoft.CSharp" Version="4.7.0" />
     <PackageReference Include="System.ComponentModel.Annotations" Version="4.7.0" />
     <PackageReference Include="System.Memory" Version="4.5.4" Condition="'$(TargetFramework)' == 'netstandard2.0'" />