www/mod_rivet: Update 3.2.0 => 3.3.1
Release Notes:
https://tcl.apache.org/rivet/html/release%2dnotes.html
PR: 297580
Reported by: diizzy
Approved by: jeff.lawson@flightaware.com (maintainer timeout, 3 weeks)
Approved by: osa, vvd (Mentors, implicit)