Bump async from 2.6.3 to 2.6.4 in /socket.io.server#189

dependabot[bot] wants to merge 1 commit intomaininfitio/flutter_socket_io:mainfrom

dependabot/npm_and_yarn/socket.io.server/async-2.6.4infitio/flutter_socket_io:dependabot/npm_and_yarn/socket.io.server/async-2.6.4Copy head branch name to clipboard