Freeze v1beta9 config

[corneliusweig]

No description provided.

[corneliusweig]

I'll be away for a few days. So if anything needs to be amended, either ditch this PR or feel free to fix it without me.

[codecov-io]

Codecov Report

Merging #2035 into master will increase coverage by 0.05%.
The diff coverage is 80%.

@@            Coverage Diff             @@
##           master    #2035      +/-   ##
==========================================
+ Coverage   55.96%   56.01%   +0.05%     
==========================================
  Files         173      175       +2     
  Lines        7566     7594      +28     
==========================================
+ Hits         4234     4254      +20     
- Misses       2928     2932       +4     
- Partials      404      408       +4

Impacted Files	Coverage Δ
pkg/skaffold/schema/versions.go	74.35% <ø> (ø)	⬆️
pkg/skaffold/schema/latest/config.go	100% <ø> (ø)	⬆️
pkg/skaffold/schema/v1beta8/upgrade.go	58.2% <100%> (ø)	⬆️
pkg/skaffold/schema/v1beta9/config.go	100% <100%> (ø)
pkg/skaffold/schema/v1beta9/upgrade.go	66.66% <66.66%> (ø)

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