Update CODEOWNERS

[jmagman]

Remove cbracken as CODEOWNER.

We would like to have two owners per iOS package, but until we can redistribute let's remove.

Pre-Review Checklist

• I read the Contributor Guide and followed the process outlined there for submitting PRs.
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• The title of the PR starts with the name of the package surrounded by square brackets, e.g. [shared_preferences]
• I linked to at least one issue that this PR fixes in the description above.
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[gemini-code-assist]

Code Review

This pull request removes cbracken as a CODEOWNER from several packages. While this aligns with the stated goal of having two owners per iOS package, it temporarily leaves some packages with only one owner, which could increase maintenance risk.