Memory leak when using keepAlive

[marwan38]

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This is a direct copy of https://github.com/node-fetch/node-fetch/pull/1474.

We're having memory leak issues as we're using a http agent with keepAlive options with the fetch used on the remix server.

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🦋 Changeset detected

Latest commit: 23b7098dad63c17021af8eace04503fa6202abe7

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

This PR includes changesets to release 1 package

Name	Type
@remix-run/web-fetch	Patch

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