fix v3alpha version

[yuwenma]

Related: #5673

[codecov]

Codecov Report

Merging #6084 (ae22071) into master (00b14d1) will decrease coverage by 0.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #6084      +/-   ##
==========================================
- Coverage   70.21%   70.20%   -0.02%     
==========================================
  Files         475      475              
  Lines       18150    18150              
==========================================
- Hits        12744    12742       -2     
- Misses       4470     4471       +1     
- Partials      936      937       +1     

Impacted Files	Coverage Δ
pkg/skaffold/schema/versions.go	83.20% <ø> (ø)
pkg/skaffold/util/tar.go	50.66% <0.00%> (-5.34%)	⬇️
pkg/skaffold/docker/parse.go	87.14% <0.00%> (+0.95%)	⬆️

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