net/scamper: update to 20211212e

ChangeLog:
https://mailman.caida.org/pipermail/scamper-announce/2022-December/000028.html

scamper:

• gracefully handle situations where there is no /etc/resolv.conf, or no nameserver lines in an /etc/resolv.conf but a measurement or scamper-internal task wants to resolve a name
• tidy up buggy prinf-like statements in scamper and some drivers.

warts/json:

• in JSON output for ping, print the TCP/UDP src/dst ports or ICMP id/seq used in individual probe packets,
• fix regression in libscamperfile so that it can read old warts files.

PR: 268345
Reported by: mjl@luckie.org.nz (maintainer)