Unskip upgrade from latest minor tests

[sp1999]

Issue #, if available:
#2402

Description of changes:
Unskip upgrade from latest minor tests now that the EKS-A latest minor release v0.21.0 is out.

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[sp1999]

/approve

[eks-distro-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: sp1999

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[sp1999]

/cherry-pick release-0.21

[eks-distro-pr-bot]

@sp1999: once the present PR merges, I will cherry-pick it on top of release-0.21 in a new PR and assign it to you.

In response to this:

/cherry-pick release-0.21

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.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 72.41%. Comparing base (0a929f4) to head (d45341f).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #8954   +/-   ##
=======================================
  Coverage   72.41%   72.41%           
=======================================
  Files         578      578           
  Lines       45386    45386           
=======================================
  Hits        32866    32866           
  Misses      10790    10790           
  Partials     1730     1730           

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[eks-distro-pr-bot]

@sp1999: new pull request created: #8955

In response to this:

/cherry-pick release-0.21

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.