Add 9.29.1 hotfix release to changelog

[vegaro]

Summary

• Adds the missing 9.29.1 hotfix entry to CHANGELOG.md
• This release backported PW-1178 (package-level visibility support) to the 9.x line via Release/9.29.1 #3320

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Note

Low Risk
Documentation-only change that updates release notes; no code or runtime behavior is affected.

Overview
Adds the missing 9.29.1 release entry to CHANGELOG.md, documenting the RevenueCatUI Paywalls v2 hotfix for PW-1178 (package-level visibility support).

^{Reviewed by Cursor Bugbot for commit 2881b15. Bugbot is set up for automated code reviews on this repo. Configure here.}

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 79.22%. Comparing base (d6e6974) to head (2881b15).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #3340   +/-   ##
=======================================
  Coverage   79.22%   79.22%           
=======================================
  Files         352      352           
  Lines       14104    14104           
  Branches     1943     1943           
=======================================
  Hits        11174    11174           
  Misses       2132     2132           
  Partials      798      798           

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