update golang.org/x dependencies
Before the next alpha release.
Signed-off-by: Daniel Martí <mvdan@mvdan.cc>
Change-Id: I2b7da474c053b2d589572acc2ef328631c9039c4
Reviewed-on: https://review.gerrithub.io/c/cue-lang/cue/+/1212513
Unity-Result: CUE porcuepine <cue.porcuepine@gmail.com>
TryBot-Result: CUEcueckoo <cueckoo@cuelang.org>
Reviewed-by: Matthew Sackman <matthew@cue.works>