Do not allow objectish `[]` event data; only actual objects

[jpwilliams]

Summary

Disallows setting the data of an event to something that is not an {} object.

Checklist

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

[changeset-bot[bot]]

🦋 Changeset detected

Latest commit: 23f24f7795e8a16bb70577e8658ea1cb452afaf3

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

This PR includes changesets to release 1 package

| Name | Type | | ------- | ----- | | inngest | Patch |

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