net/v2ray: Update to 4.20.0

• Dependencies are not shipped with the tarball anymore, define these dependencies in GH_TUPLE.
• Add test target

Changelog:

https://github.com/v2ray/v2ray-core/compare/v4.14.0...v4.20.0

PR: 239219
Reviewed by: koobs
Approved by: koobs (mentor), shen.elf@gmail.com (maintainer timeout)
Differential Revision: https://reviews.freebsd.org/D20968