test(Podfile): use firestore-ios-framework version vs master

[mikehardy]

Description

The test podfile was pointing at master, but that can cause problems if the newest ios release is different then the one under test. They must be the same, so use the tag on firebase-ios-sdk-frameworks at the specified version vs master

Noticed while developing #4471 as it caused test app compile errors during baseline as master was 7.0.0 while I was still on 6.x.x originally

Release Summary

named with conventional commit

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 actually is a test, so the test app either compiles or it doesn't, but with this change it will compile reliably

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[codecov]

Codecov Report

Merging #4640 (000a7dd) into master (e7688e8) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #4640   +/-   ##
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  Coverage   88.93%   88.93%           
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  Files         109      109           
  Lines        3712     3712           
  Branches      347      347           
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  Hits         3301     3301           
  Misses        369      369           
  Partials       42       42