🌱 test: fix inject install on bootstrap script to allow downgrades

[chrischdi]

What this PR does / why we need it:

The script did not downgrade the packages because it did not get any input.

Which issue(s) this PR fixes (optional, in fixes #<issue number>(, fixes #<issue_number>, ...) format, will close the issue(s) when PR gets merged):
Fixes #

[sbueringer]

/lgtm
/approve

Thx!

[k8s-ci-robot]

LGTM label has been added.

Git tree hash: 330bed7c6f3921ae744623616d16c92fcdc4b7c9

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: sbueringer

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[sbueringer]

/cherry-pick release-1.9

[k8s-infra-cherrypick-robot]

@sbueringer: once the present PR merges, I will cherry-pick it on top of release-1.9 in a new PR and assign it to you.

In response to this:

/cherry-pick release-1.9

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (bbe97bb) 64.52% compared to head (539d73b) 64.54%.
Report is 3 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2701      +/-   ##
==========================================
+ Coverage   64.52%   64.54%   +0.02%     
==========================================
  Files         118      119       +1     
  Lines        8620     8640      +20     
==========================================
+ Hits         5562     5577      +15     
- Misses       2626     2630       +4     
- Partials      432      433       +1     

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[k8s-infra-cherrypick-robot]

@sbueringer: new pull request created: #2702

In response to this:

/cherry-pick release-1.9

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes/test-infra repository.