Fix Map method call failures with Grpc.AspNetCore.Server 2.76.0 and later.#1037

mayuki merged 2 commits intomainCysharp/MagicOnion:mainfrom

feature/FixMapGrpcAspNetCore2.76.0Cysharp/MagicOnion:feature/FixMapGrpcAspNetCore2.76.0Copy head branch name to clipboard