[Snyk] Security upgrade proxy-agent from 2.3.1 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	Priority Score (*)	Issue	Breaking Change	Exploit Maturity
	778/1000 Why? Proof of Concept exploit, Recently disclosed, Has a fix available, CVSS 7.7	Server-side Request Forgery (SSRF) SNYK-JS-NETMASK-1089716	Yes	Proof of Concept

(*) Note that the real score may have changed since the PR was raised.

Commit messages

Package name: proxy-agent

The new version differs by 17 commits.

• b9fcf37 4.0.0
• d18c6bd Update `agent-base` to v6 (#55)
• 4af6f5e 3.1.1
• af5434d Update "pack-proxy-agent" to v3.0.1
• cd18ccf Use `localhost` instead of `127.0.0.1` for tests
• 778ea05 Update dependencies
• 70ffd00 Meh…
• 1a1abb5 Use GH Actions instead of Travis-CI
• 3588645 Update `https-proxy-agent` to v3.0.0 (#47)
• 10ff67b 3.1.0
• 063ad8f Remove `package-lock.json` file
• 199f29f Add TypeScript types (#34)
• bfe9ec5 3.0.3
• d32e248 Upgrade pac-proxy-agent to 3.x (#31)
• d392bc7 Release 3.0.1 (#30)
• d67cb23 Update `socks-proxy-agent` to v4.0.1 (#26)
• 65fcf7a Release 3.0.0 (#22)

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[bot]]

Codecov Report

Merging #68 (b82c605) into master (40bf197) will not change coverage. The diff coverage is n/a.

:exclamation: Current head b82c605 differs from pull request most recent head 659bbc1. Consider uploading reports for the commit 659bbc1 to get more accurate results

@@           Coverage Diff           @@
##           master      #68   +/-   ##
=======================================
  Coverage   83.87%   83.87%           
=======================================
  Files           1        1           
  Lines         217      217           
=======================================
  Hits          182      182           
  Misses         35       35           

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