net/sock: update 0.3.2 -> 0.4.2

• IPv6 is supported now
• supports SCTP in addition to UDP and TCP
• socket options can now be used

PR: 217909, 218298
Changes: https://github.com/sjac999/sock_ipv6_sctp/blob/master/ChangeLog
Submitted by: Steve Jacobson <sjac@cs.stanford.edu> (maintainer)