Bump HotChocolate.AspNetCore from 15.1.16 to 16.0.0 (#166)

Author: dependabot[bot]

src/HotChocolateGraphQL.Backend/HotChocolateGraphQL.Backend.csproj

@@ -5,7 +5,7 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="HotChocolate.AspNetCore" Version="15.1.16" />
+    <PackageReference Include="HotChocolate.AspNetCore" Version="16.0.0" />
     <PackageReference Include="Microsoft.Extensions.Http.Polly" Version="10.0.7" />
   </ItemGroup>