Add "MeansImplicitUse" for HttpClientJsonExtensions.GetFromJsonAsync``1

[sirduke]

using System.Net.Http;
using System.Net.Http.Json;
using System.Threading.Tasks;

public class C
{
    private readonly HttpClient _httpClient = new();

    public async Task GetResult()
    {
        var response = await _httpClient.GetFromJsonAsync<MyObject>(new Uri(""));
    }

    private class MyObject {} // should not show warning "class is never instantiated
}