MFH: r553445

dns/ddclient: Update to v3.9.1

ChangeLog: https://github.com/ddclient/ddclient/releases/tag/v3.9.1

PR: 250572
Submitted by: root@cooltrainer.org
Approved by: mjl@luckie.org.nz (maintainer)

Approved by: ports-secteam (blanket, runtime fix)