bulk/testpost OK: 12, 13, main (CURRENT/HEAD)

while here,

- USE_GITHUB=yes (follows upstream);
- update base Golan dependencies;
- apply backport fix for CVE-2021-34558 on 'utls';
- goptlib goes from 0.7 to 1.2.0;
- fix `test` target run;
- maintainer reset, after long time hiatus in Bugzilla (6months+).