[infra] Add UpdateGoDeps bot

Change-Id: I8cb78d16589b28b2965962caf7a455bf046c4b15
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/216340
Commit-Queue: Eric Boren <borenet@google.com>
Reviewed-by: Ben Wagner aka dogben <benjaminwagner@google.com>
5 files changed