security: fix CVE-2021-43618

[chewong]

Reason for Change:

Fixes CVE-2021-43618 - https://dev.azure.com/AzureContainerUpstream/AAD%20Pod%20Identity/_build/results?buildId=34429&view=logs&j=7e664a44-1d98-5348-601c-dff379a14ab5&t=df0bac15-41b8-536a-5d4e-7c9def102aed

Requirements

• squashed commits
• included documentation
• added unit tests and e2e tests (if applicable). See test standard for more details.
• ran make precommit

Issue Fixed:

Please answer the following questions with yes/no:

Does this change contain code from or inspired by another project? If so, did you notify the maintainers and provide attribution?

• yes
• no

Notes for Reviewers:

[codecov]

Codecov Report

Merging #1224 (9c8a302) into master (6dc82f9) will decrease coverage by 0.11%.
The diff coverage is 32.25%.

@@            Coverage Diff             @@
##           master    #1224      +/-   ##
==========================================
- Coverage   36.29%   36.17%   -0.12%     
==========================================
  Files          27       32       +5     
  Lines        2915     4403    +1488     
==========================================
+ Hits         1058     1593     +535     
- Misses       1778     2728     +950     
- Partials       79       82       +3