Update Carthage distribution for 8.0.0

[paulb777]

This PR is the resulting build distribution from the fixes in #8084

Fix #7039
Fix #7576

Will publish the Carthage update when #8084 and this PR are approved.

Testing:
Unzipped the archive from https://github.com/firebase/firebase-ios-sdk/actions/runs/845683211

Edited the json files in a local directory:

Edited the sample in Carthage.md like

Verified carthage update succeeded.

[google-oss-bot]

Coverage Report

Affected SDKs

• FirebaseAuth-iOS-FirebaseAuth.framework

  SDK overall coverage changed from 68.78% (4f00074) to 68.77% (73911aa) by -0.01%.

  Filename	Base (4f00074)	Head (73911aa)	Diff
  FIRAuthKeychainServices.m	60.16%	59.38%	-0.78%

• FirebaseDynamicLinks-iOS-FirebaseDynamicLinks.framework

  SDK overall coverage changed from 60.91% (4f00074) to 75.57% (73911aa) by +14.66%.

  Filename	Base (4f00074)	Head (73911aa)	Diff
  FDLUtilities.m	73.48%	90.15%	+16.67%
  FIRDLDefaultRetrievalProcessV2.m	14.06%	72.92%	+58.85%
  FIRDLJavaScriptExecutor.m	26.28%	82.48%	+56.20%
  FIRDynamicLinkNetworking.m	44.44%	80.83%	+36.39%

Test Logs

• Base (4f00074a): https://github.com/firebase/firebase-ios-sdk/actions/runs/850868238
• Head (73911aa9): https://github.com/firebase/firebase-ios-sdk/actions/runs/850974577

[ryanwilson]

These URLs are 404ing for me at the moment - changes look good otherwise outside of a question about MLModelDownloader + zip/binary availability

[paulb777]

They're 404'ing because not yet published since waiting for reviews.

If we once excluded MLModelDownloader, it's no longer happening since it's already part of the 8.0.0 zip distro.

[paulb777]

8.0.0 is now distributed via Carthage