fix: add missing concurrency options to function validation

[stefanosala]

Summary

After #625 we started getting these type of messages while having correct config:

[NEXT] [Inngest] error - Config invalid for function "XXX" : Unrecognized key(s) in object: 'concurrency'

This should fix it.

Checklist

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

[changeset-bot[bot]]

🦋 Changeset detected

Latest commit: 3eab84fdbea5f53a8cd4a829ae640a195fa92705

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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[stefanosala]

Thanks @jpwilliams !

[jpwilliams]

Thank you, @stefanosala!