quote goptlib from locally when git.torproject.org not available online

[mebest100]

Quote goptlib from locally when git.torproject.org not available online. That because simply quote from gitlab.torproject.org will cause error of “parsing go.mod: module declares its path as xxx but was required as: xxx” despite torproject officially announce it change to https://gitlab.torproject.org/tpo/anti-censorship/pluggable-transports/goptlib