Stop krew update for release-1.7

[RainbowMango]

What type of PR is this?
/kind cleanup

What this PR does / why we need it:

Stop krew update on release-1.7, see #4703 for more details.

Which issue(s) this PR fixes:
Fixes #

Special notes for your reviewer:

Does this PR introduce a user-facing change?:

NONE

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 53.87%. Comparing base (c7626d6) to head (5cda41b).

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Additional details and impacted files

@@             Coverage Diff              @@
##           release-1.7    #4767   +/-   ##
============================================
  Coverage        53.86%   53.87%           
============================================
  Files              231      231           
  Lines            22964    22964           
============================================
+ Hits             12370    12371    +1     
+ Misses            9924     9923    -1     
  Partials           670      670           

Flag	Coverage Δ
unittests	53.87% <ø> (+<0.01%)	⬆️

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