Pass `req` to `getProxyForUrl` callback

[addaleax]

This allows more flexibility in the callback, e.g. for inspecting request headers before deciding on a given proxy.

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🦋 Changeset detected

Latest commit: ecf23dcd9e805ca43a738dbd266f6c2a25b45601

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

This PR includes changesets to release 1 package

| Name | Type | | ----------- | ----- | | proxy-agent | Minor |

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Name	Status	Preview	Updated (UTC)
proxy-agents	✅ Ready (Inspect)	Visit Preview	Aug 7, 2024 1:25pm