fix: ACNA-3241 - upgrade proxy agent dependencies

[shazron]

Motivation and Context

Depends on #70 (incorporates the commits from that already)
Fixes #69
⚠️ need to revert and update the @adobe/aio-lib-test-proxy dev dep once the new release is out.

How Has This Been Tested?

• npm test

Screenshots (if appropriate):

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• I have signed the Adobe Open Source CLA.
• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have read the CONTRIBUTING document.
• I have added tests to cover my changes.
• All new and existing tests passed.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 100.00%. Comparing base (6ce8e1c) to head (c0b8063).
Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff            @@
##            master       #71   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            5         5           
  Lines          135       139    +4     
  Branches        31        31           
=========================================
+ Hits           135       139    +4     

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[amulyakashyap09]

LGTM!