[http-proxy-agent] Fix `keepAlive: true`

[TooTallNate]

Based on #169.

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🦋 Changeset detected

Latest commit: af93b0c0a45f211369dae1eb2407c7a781a33beb

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

| Name | Type | | ---------------- | ----- | | http-proxy-agent | Patch |

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Name	Status	Preview	Updated (UTC)
proxy-agents	✅ Ready (Inspect)	Visit Preview	May 24, 2023 8:28pm