v1.2.1: uplink-c: keep go-gpl2.mod up-to-date
This change bumped the https://github.com/storj/uplink dependency from v1.4.1 to v1.4.2.
This change also fixed the GPL2 compatible build mode (which strips out Apache v2 dependencies) to use the same dependency versions as the default build mode (thus upgrading the uplink dependency in GPL2 compatible mode from v1.1.3 to 1.4.2 as well).