[assert] fix, allow Object.create(null) and disallow stringTagName and iterator symbols

[belgattitude]

See https://stackoverflow.com/a/76387885/5490184

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🦋 Changeset detected

Latest commit: c7ce0ce

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

This PR includes changesets to release 2 packages

Name	Type
@httpx/assert	Patch
@examples/nextjs-app	Patch

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