fix(ios, expo): use modern import style, required by Expo 44+

[mikehardy]

Description

Expo 44+ enforces use of new import style for React headers, and they
are supported far enough back in time on react-native versions this should
not be breaking for anyone

Related issues

Fixes #5965

Release Summary

single commit, it's conventionsl

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

It's an iOS import style change, either it compiles or it does not. Compiles in local testing, e2e will check as well of course

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[vercel]

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react-native-firebase – ./

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[codecov]

Codecov Report

Merging #6126 (fe6d223) into main (1fe6ac7) will not change coverage.
The diff coverage is n/a.

❗ Current head fe6d223 differs from pull request most recent head 64f3999. Consider uploading reports for the commit 64f3999 to get more accurate results

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  Hits           5408     5408           
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