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Greg Spencer authored
## Description Removes references to `ThemeData.primaryColorBrightness`, deprecated in https://github.com/flutter/flutter/pull/93396 and subject to remove now because of our [deprecation policy](https://github.com/flutter/flutter/wiki/Tree-hygiene#deprecations). ## Related PRs - https://github.com/flutter/flutter/pull/93396 ## Tests - Removed unneeded tests, removed references.