Fix typing for `"inngest/lambda"` handler being incorrect Proxy type

[jpwilliams]

Summary

Fix incorrect type being used for "inngest/lambda" handler following #587.

Checklist

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

Related

• Caused by #587

[changeset-bot[bot]]

🦋 Changeset detected

Latest commit: 8b9786ff2a83762d3f6bb40683d17b36e47ae0bd

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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