Update channel member
PATCH https://graph.microsoft.com/v1.0/teams/{{GroupId}}/channels/{{ChannelId}}/members/{{UserId}}
Request Body
{"@odata.type"=>"#microsoft.graph.aadUserConversationMember", "roles"=>["owner"]}
PATCH https://graph.microsoft.com/v1.0/teams/{{GroupId}}/channels/{{ChannelId}}/members/{{UserId}}
{"@odata.type"=>"#microsoft.graph.aadUserConversationMember", "roles"=>["owner"]}