feat(ios): bump firebase-ios-sdk dependency to 8.4.0

[mikehardy]

Description

Standard native SDK bump

Release Summary

Conventional commit / PR title

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

CI only

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react-native-firebase – ./

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react-native-firebase-next – ./website_modular

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[codecov]

Codecov Report

Merging #5538 (df40961) into master (fe5290f) will decrease coverage by 3.80%.
The diff coverage is n/a.

❗ Current head df40961 differs from pull request most recent head b66b4c6. Consider uploading reports for the commit b66b4c6 to get more accurate results

@@             Coverage Diff              @@
##             master    #5538      +/-   ##
============================================
- Coverage     71.48%   67.69%   -3.79%     
- Complexity        0      984     +984     
============================================
  Files            96      189      +93     
  Lines          4287     9527    +5240     
  Branches        921     1487     +566     
============================================
+ Hits           3064     6448    +3384     
- Misses         1127     2670    +1543     
- Partials         96      409     +313