fix: allow undefined to be resolved with <Await>

[jacob-ebey]

Fixes remix-run/remix#9325

[changeset-bot]

🦋 Changeset detected

Latest commit: dfc66df

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

This PR includes changesets to release 4 packages

Name	Type
react-router	Patch
react-router-dom	Patch
react-router-dom-v5-compat	Patch
react-router-native	Patch

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[brophdawg11]

Discussed in discord but this is good to merge since it wont change defer behavior because defer already rejects with an error if you resolve with undefined (Deferred data for key ... resolved/rejected with undefined, you must resolve/reject with a value or null).

We want to align the behavior behind the single fetch flag for the next major version and stop throwing on returning undefined from a loader since we have no issues serializing that now (as opposed to when we were using JSON.stringify)

[github-actions]

🤖 Hello there,

We just published version 6.23.1-pre.0 which includes this pull request. If you'd like to take it for a test run please try it out and let us know what you think!

Thanks!

[github-actions]

🤖 Hello there,

We just published version 6.23.1 which includes this pull request. If you'd like to take it for a test run please try it out and let us know what you think!

Thanks!