upgrade tor package to v0.4.6.8-r0 (see below)
https://web.archive.org/web/20211219210312/https://gitweb.torproject.org/tor.git/plain/ChangeLog
https://git.alpinelinux.org/aports/commit/community/tor?h=3.15-stable&id=178008f6bd3a8c810e17902277ffa30bb59933a1
https://github.com/fphammerle/docker-tor-obfs4-bridge/commit/f76e89e788260385778d0692741bfa23c9ec16ac