update github.com/emicklei/proto
Since the last update in https://cuelang.org/cl/537702
the library had already gotten two years out of date.
No apparent breaking changes in our code or tests.
Signed-off-by: Daniel Martí <mvdan@mvdan.cc>
Change-Id: I8d9549e1d2d55c3af82ea9096d9c2b1a7e1f3e70
Reviewed-on: https://review.gerrithub.io/c/cue-lang/cue/+/1196293
TryBot-Result: CUEcueckoo <cueckoo@cuelang.org>
Unity-Result: CUE porcuepine <cue.porcuepine@gmail.com>
Reviewed-by: Paul Jolly <paul@myitcv.io>