Remove `as string` casting of `unknown `error` when parsing API errors

[jpwilliams]

Summary

Fixes #482, removing an as string cast for an unknown error thrown from fetching data from the API.

An ESLint rule that requires an exemption when casting would be good.

Checklist

• [ ] Added a docs PR that references this PR N/A Bug fix
• [ ] Added unit/integration tests N/A
• [x] Added changesets if applicable

Related

• Fixes #482

[changeset-bot[bot]]

🦋 Changeset detected

Latest commit: 2d0d10f4a0454b4ba18cc980096fc946fe62bc6f

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

This PR includes changesets to release 1 package

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