devel/mongo-c-driver: Update 1.30.8 => 2.3.3
While here, add a new VERSION substition for pkg-plist easy updates.
Changelog:
https://github.com/mongodb/mongo-c-driver/blob/2.3.3/NEWS
PR: 296601
Reported by: Hiroo Ono <hiroo.ono+freebsd@gmail.com>
Approved by: Krzysztof <ports@bsdserwis.com> (maintainer)
Approved by: osa, vvd (Mentors, implicit)