[cupertino_icons] Add glyph references for brightness and brightness_filled (#36174)

packages/flutter/lib/src/cupertino/icons.dart

diff --git a/packages/flutter/lib/src/cupertino/icons.dart b/packages/flutter/lib/src/cupertino/icons.dart
index d29449f..25dac58 100644
--- a/packages/flutter/lib/src/cupertino/icons.dart
+++ b/packages/flutter/lib/src/cupertino/icons.dart
@@ -922,4 +922,18 @@
   ///
   ///  * [news], same shape, but not filled in.
   static const IconData news_solid = IconData(0xf472, fontFamily: iconFont, fontPackage: iconFontPackage);
+
+  /// A outlined brightness icon.
+  ///
+  /// See also:
+  ///
+  ///  * [brightness_solid], same shape, but filled in.
+  static const IconData brightness = IconData(0xf4B6, fontFamily: iconFont, fontPackage: iconFontPackage);
+
+  /// A filled in brightness icon.
+  ///
+  /// See also:
+  ///
+  ///  * [brightness], same shape, but not filled in.
+  static const IconData brightness_solid = IconData(0xf4B7, fontFamily: iconFont, fontPackage: iconFontPackage);
 }