Update Skaffold dependencies

[briandealwis]

Update to latest stable versions. A few notes:

• Moved to Kubectl 1.17 to track the default version used in Google Cloud SDK 322.0.0
• Kustomize 3.9.x uses a new underlying YAML library (kyaml), and 3.8.x is based on the older api-machinery code.
• Drops the pre-pulling of the K3D and KIND node images as it's a bit of a pain to track these images.

[codecov]

Codecov Report

Merging #5215 (b725c1e) into master (d439550) will increase coverage by 0.00%.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #5215   +/-   ##
=======================================
  Coverage   71.84%   71.84%           
=======================================
  Files         387      387           
  Lines       13939    13939           
=======================================
+ Hits        10014    10015    +1     
+ Misses       3191     3190    -1     
  Partials      734      734           

Impacted Files	Coverage Δ
pkg/skaffold/docker/image.go	78.13% <0.00%> (-1.40%)	⬇️
pkg/skaffold/util/tar.go	56.00% <0.00%> (+5.33%)	⬆️

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[nkubala]

nice, thanks