pinning newman version to 5.3.2 as mac CI was flaky

[agunapal]

Description

newman published a new version yesterday, which started breaking our CI

https://www.npmjs.com/package/newman?activeTab=versions

Pinning the version to 5.3.2

This fixes mac regression issues
https://github.com/pytorch/serve/actions/runs/6201889968/job/16839506337

Fixes #(issue)

Type of change

Please delete options that are not relevant.

• Bug fix (non-breaking change which fixes an issue)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• New feature (non-breaking change which adds functionality)
• This change requires a documentation update

Feature/Issue validation/testing

Please describe the Unit or Integration tests that you ran to verify your changes and relevant result summary. Provide instructions so it can be reproduced.
Please also list any relevant details for your test configuration.

• Test A
  Logs for Test A

• Test B
  Logs for Test B

Checklist:

• Did you have fun?
• Have you added tests that prove your fix is effective or that this feature works?
• Has code been commented, particularly in hard-to-understand areas?
• Have you made corresponding changes to the documentation?

[msaroufim]

Which CI job did this fix? I still see lots of red

[codecov]

Codecov Report

Merging #2598 (76fdd70) into master (9cd3389) will not change coverage.
The diff coverage is n/a.

❗ Current head 76fdd70 differs from pull request most recent head 8a4e682. Consider uploading reports for the commit 8a4e682 to get more accurate results

@@           Coverage Diff           @@
##           master    #2598   +/-   ##
=======================================
  Coverage   70.87%   70.87%           
=======================================
  Files          83       83           
  Lines        3839     3839           
  Branches       58       58           
=======================================
  Hits         2721     2721           
  Misses       1114     1114           
  Partials        4        4           

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[msaroufim]

this seems to fix the mac test so stamping