upgrade schema to v2beta15

[gsquared94]

No description provided.

[codecov]

Codecov Report

Merging #5700 (6e2558a) into master (e947844) will decrease coverage by 0.20%.
The diff coverage is 27.02%.

@@            Coverage Diff             @@
##           master    #5700      +/-   ##
==========================================
- Coverage   70.64%   70.44%   -0.21%     
==========================================
  Files         411      413       +2     
  Lines       15860    15934      +74     
==========================================
+ Hits        11205    11225      +20     
- Misses       3827     3877      +50     
- Partials      828      832       +4     

Impacted Files	Coverage Δ
pkg/skaffold/schema/latest/config.go	58.82% <ø> (ø)
pkg/skaffold/schema/v2beta13/upgrade.go	100.00% <ø> (ø)
pkg/skaffold/schema/versions.go	82.41% <ø> (ø)
pkg/skaffold/schema/v2beta14/config.go	20.58% <20.58%> (ø)
pkg/skaffold/schema/v2beta14/upgrade.go	100.00% <100.00%> (ø)

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