net/scapy: Update to upstream release 2.3.3

Update to latest tagged release

Upstream moved to github so we can now track releases there:
https://github.com/secdev/scapy/releases/tag/v2.3.3

Add upstream matplotlib support

Reviewed by: Sergey Kozlov <kozlov.sergey.404@gmail.com>
Approved by: Maintainer Timeout (2 weeks)
Differential Revision: https://reviews.freebsd.org/D13572