update vendor.json with a real commit for saltpack/encoding/basex
update vendor.json with a real commit for saltpack/encoding/basex

This is part of getting client and kbfs on the same page. No actual file
changes. (The previous commit seems to be a never-pushed-publicly
phantom commit.)

keybase/client,keybase/client,keybase/client,keybase/client,keybase/client,keybase/client,keybase/client,keybase/client,keybase/client,keybase/client,keybase/client,keybase/client