security/lasso: Update version 2.6.1=>2.7.0

Relnotes: https://git.entrouvert.org/lasso.git/tree/NEWS?id=v2.7.0
Security: https://www.vuxml.org/freebsd/417de1e6-c31b-11eb-9633-b42e99a1b9c3.html
(cherry picked from commit fcbade26f768bbcf2556a61fa8b5a622a9a77260)