Freeze v1beta11 config

[michaelbeaumont]

#2188 would be ready to review/test/merge

[codecov-io]

Codecov Report

Merging #2207 into master will increase coverage by 0.04%.
The diff coverage is 71.42%.

@@            Coverage Diff             @@
##           master    #2207      +/-   ##
==========================================
+ Coverage   58.55%   58.59%   +0.04%     
==========================================
  Files         188      190       +2     
  Lines        7882     7910      +28     
==========================================
+ Hits         4615     4635      +20     
- Misses       2877     2881       +4     
- Partials      390      394       +4

Impacted Files	Coverage Δ
pkg/skaffold/schema/v1beta10/upgrade.go	66.66% <ø> (ø)	⬆️
pkg/skaffold/schema/versions.go	74.35% <ø> (ø)	⬆️
pkg/skaffold/schema/latest/config.go	100% <ø> (ø)	⬆️
pkg/skaffold/schema/v1beta11/config.go	100% <100%> (ø)
pkg/skaffold/schema/v1beta11/upgrade.go	66.66% <66.66%> (ø)

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[balopat]

Closing in favor for #2329.