Update go-containerregistry to 0.5.1

[briandealwis]

Description
Update go-containerregistry to 0.5.1 to pull in the fix from google/go-containerregistry#1017.

This should address a report from @russwolf where Skaffold failed during a file-sync with a Buildpacks image, where the image was a remote image built using GCB:

files modified: [src/index.html.hbs]
error adding dirty artifact to changeset: retrieving labels for \"gcr.io/next-london-cloudcode/nodejs-hello-world:latest@sha256:7f72c0ed595081552a94d4c4400d89be0c49844dfd3a138b849651aafb220b35\": retrieving image config: error executing `gcloud config config-helper`: exec: already started

[codecov]

Codecov Report

Merging #5881 (3022c38) into master (ff5038a) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #5881   +/-   ##
=======================================
  Coverage   70.91%   70.91%           
=======================================
  Files         447      447           
  Lines       16908    16908           
=======================================
  Hits        11990    11990           
  Misses       4028     4028           
  Partials      890      890           

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