fix: keep dedupe tracking the request that replaced a cancelled one

[knd775]

With @dedupe(cancelFirst: true), a new request aborts the in-flight one and takes over its entry in the dedupe tracker. When the aborted request settled, its cleanup deleted that entry, so the replacement request was no longer tracked. The next request then found nothing to cancel, and the two ran side by side.

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• If applicable, add a test that would fail without this fix
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[changeset-bot]

🦋 Changeset detected

Latest commit: 61602f3

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

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houdini	Patch

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