fix(nextjs-mf): enable async function support

[ScriptedAlchemy]

Description

Enable async function in env options

Stops async external warnings

Related Issue

Types of changes

• [ ] Docs change / refactoring / dependency upgrade
• [x] Bug fix (non-breaking change which fixes an issue)
• [ ] New feature (non-breaking change which adds functionality)

Checklist

• [ ] I have added tests to cover my changes.
• [ ] All new and existing tests passed.
• [ ] I have updated the documentation.

[changeset-bot[bot]]

🦋 Changeset detected

Latest commit: c96713b224d65da64381480dd82e7a6d831b0d6c

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

This PR includes changesets to release 1 package

| Name | Type | | ---------------------------- | ----- | | @module-federation/nextjs-mf | Patch |

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