security/obfs4proxy-tor: update 0.0.11_2 to 0.0.12

while here,

make sure we rely only on USE_GITLAB and USE_GITHUB for its MASTER_SITES;
update Go mod dependencies.

CHANGELOG

• • Fix Elligator2 public key representative leak;
  • Replace the extra25519 import with an internal package;
  • Update the Azure TLS certificate digest;
  • Make the -unsafeLogging command line switch work;
  • Bump the version of the utls fork;
  • add the Chrome 83 fingerprint.
• https://lists.torproject.org/pipermail/anti-censorship-team/2022-January/000213.html

Sponsored by: TorBSD Diversity Project (TDP)
Sponsored by: The Tor Project