Update dependency proxy-agent to v6

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
proxy-agent	5.0.0 -> 6.1.1

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Release Notes

TooTallNate/proxy-agents

v6.1.1

Compare Source

Patch Changes

• f30ed32: Use HttpProxyAgent for "http" and HttpsProxyAgent for "https"

v6.1.0

Minor Changes

• 9a90063: Add support for httpAgent and httpsAgent options

v6.0.0

Major Changes

• d99a7c8: Major version bump for all packages

Minor Changes

• 4333067: Add support for core keepAlive: true

Patch Changes

• c169ced: Convert mocha tests to jest for all packages
• Updated dependencies [c169ced]
• Updated dependencies [d99a7c8]
• Updated dependencies [4333067]
• Updated dependencies [06775a8]
  • https-proxy-agent@6.0.0
  • socks-proxy-agent@8.0.0
  • http-proxy-agent@6.0.0
  • pac-proxy-agent@6.0.0
  • agent-base@7.0.0

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