feat(app, sdks): firebase-ios-sdk 7.4.0 / firebase-android-sdk 26.3.0

[mikehardy]

minor version bumps for underlying firebase sdks on ios and android

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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[codecov]

Codecov Report

Merging #4792 (2f2f6b3) into master (b4fb976) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #4792   +/-   ##
=======================================
  Coverage   89.09%   89.09%           
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  Files         109      109           
  Lines        3712     3712           
  Branches      347      347           
=======================================
  Hits         3307     3307           
  Misses        363      363           
  Partials       42       42