net/v2ray: Update to 4.25.0

Changelog:

https://github.com/v2ray/v2ray-core/releases/tag/v4.25.0

PR: 247515
Reviewed by: koobs
Approved by: koobs (ports, mentor), shen.elf@gmail.com (maintainer)
Differential Revision: https://reviews.freebsd.org/D25424
MFH: 2020Q3 (blanket: bugfix release)