[Snyk] Security upgrade proxy-agent from 3.1.1 to 4.0.0

[snyk-bot]

Snyk has created this PR to fix one or more vulnerable packages in the `npm` dependencies of this project.

Changes included in this PR

• Changes to the following files to upgrade the vulnerable dependencies to a fixed version:
  • package.json

Vulnerabilities that will be fixed

With an upgrade:

Severity	Issue	Breaking Change	Exploit Maturity
	Server-side Request Forgery (SSRF) SNYK-JS-NETMASK-1089716	Yes	Proof of Concept

Commit messages

Package name: proxy-agent

The new version differs by 2 commits.

• b9fcf37 4.0.0
• d18c6bd Update `agent-base` to v6 (req abort event #55)

See the full diff

Check the changes in this PR to ensure they won't cause issues with your project.

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[codecov]

Codecov Report

Merging #354 (6f3d7b6) into master (95171eb) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #354   +/-   ##
=======================================
  Coverage   92.99%   92.99%           
=======================================
  Files           6        6           
  Lines         799      799           
  Branches      218      218           
=======================================
  Hits          743      743           
  Misses         56       56           

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