SDK-675: Prepare for Release 6.7.2

[github-actions]

Prepare for Release 6.7.2

SDK Release Checklist

• CHANGELOG.md updated with correct version
• Version numbers updated:
  • Iterable-iOS-SDK.podspec
  • Iterable-iOS-AppExtensions.podspec
  • sdkVersion in IterableAPI.swift
• README.md reviewed (if needed)
• All tests passing
• Documentation updated https://github.com/Iterable/iterable-docs/pull/1574

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 73.61%. Comparing base (6f97321) to head (4dc213f).

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1088   +/-   ##
=======================================
  Coverage   73.61%   73.61%           
=======================================
  Files         114      114           
  Lines       10202    10202           
=======================================
  Hits         7510     7510           
  Misses       2692     2692           

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