remove docker compose varible

src/Microsoft.Tye.Core/DockerCompose/DockerComposeParser.cs

@@ -273,8 +273,6 @@ namespace Tye.DockerCompose
                         break;
                     case "tty":
                         break;
-                    case "dependsOn":
-                        break;
                     default:
                         throw new TyeYamlException(child.Key.Start, CoreStrings.FormatUnrecognizedKey(key));
                 }