fix: correctly check for unique relation updates

[kettanaito]

• Fixes Failed to update a unique relation at "relation name": the foreign record is already associated with another owner #353

Changes

• Add missing uniqueness check when updating a referenced record.
• Guard against updating irrelevant records when an update to a relational record is triggered.

[kettanaito]

Released: v1.1.3 🎉

This has been released in v1.1.3.

• 📄 Release notes
• 📦 View on npm

Get these changes by running the following command:

npm i @msw/data@latest

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