Update grpc-health-probe to v0.4.28 in Dockerfiles

[rh-tcloud]

Description of the change:
Update grpc-health-probe to latest release.

Motivation for the change:
Closes #1410

Reviewer Checklist

• Implementation matches the proposed design, or proposal is updated to match implementation
• Sufficient unit test coverage
• Sufficient end-to-end test coverage
• Docs updated or added to /docs
• Commit messages sensible and descriptive

[openshift-ci]

Hi @rh-tcloud. Thanks for your PR.

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Once the patch is verified, the new status will be reflected by the ok-to-test label.

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 48.23%. Comparing base (2e0d6a2) to head (905580f).
Report is 5 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1425   +/-   ##
=======================================
  Coverage   48.23%   48.23%           
=======================================
  Files         136      136           
  Lines       12805    12805           
=======================================
  Hits         6176     6176           
  Misses       5594     5594           
  Partials     1035     1035           

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[perdasilva]

/lgtm
/ok-to-test

[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: perdasilva, rh-tcloud

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