fix(auth): resolve type issue when migrating to v9

[SelaseKay]

Description

Related issues

Fixes #8276

Release Summary

Checklist

• I read the Contributor Guide and followed the process outlined there for submitting PRs.
  • Yes
• My change supports the following platforms;
  • Android
  • iOS
• My change includes tests;
  • e2e tests added or updated in packages/\*\*/e2e
  • jest tests added or updated in packages/\*\*/__tests__
• I have updated TypeScript types that are affected by my change.
• This is a breaking change;
  • Yes
  • No

Test Plan

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Name	Status	Preview	Comments	Updated (UTC)
react-native-firebase	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Feb 6, 2025 4:01pm

[russellwheatley]

this needs deleting: https://github.com/invertase/react-native-firebase/blob/main/packages/database/lib/index.d.ts#L20

This needs updating as well: https://github.com/invertase/react-native-firebase/blob/main/packages/functions/lib/modular/index.d.ts#L1

Other than that, LGTM

[russellwheatley]

LGTM

[mikehardy]

Also LGTM - thanks!