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 :white_check_mark:

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

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Additional details and impacted files

```diff @@ 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](https://app.codecov.io/gh/karmada-io/karmada/pull/4767/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=karmada-io) | Coverage Δ | | |---|---|---| | [unittests](https://app.codecov.io/gh/karmada-io/karmada/pull/4767/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=karmada-io) | `53.87% <ø> (+<0.01%)` | :arrow_up: | Flags with carried forward coverage won't be shown. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=karmada-io#carryforward-flags-in-the-pull-request-comment) to find out more.

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[karmada-bot]

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