Fix CQS signal modernize-concat-nested-namespaces in xplat/js/react-native-github/packages/react-native/ReactCommon/react/renderer/graphics/platform/ios/react/renderer/graphics (#51983)

Summary: Pull Request resolved: #51983

Reviewed By: dtolnay

Differential Revision: D76494516

fbshipit-source-id: 399311ad4e1eadf6741926a19ce1919e73a1bdaa

Author: generatedunixname89002005287564

packages/react-native/ReactCommon/react/renderer/graphics/platform/ios/react/renderer/graphics/RCTPlatformColorUtils.h

@@ -10,12 +10,10 @@
 #import <UIKit/UIKit.h>
 #import <vector>
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 struct ColorComponents;
 struct Color;
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 
 facebook::react::ColorComponents RCTPlatformColorComponentsFromSemanticItems(
     std::vector<std::string>& semanticItems);