fix typo in pubspec

Author: guidezpl

packages/dynamic_color/pubspec.yaml

@@ -22,7 +22,7 @@ dependencies:
     sdk: flutter
   # Since this package is an SDK dependency, we need to support a range of versions.
   # See https://github.com/flutter/flutter/blob/main/packages/flutter/pubspec.yaml for current version used by the SDK.
-  material_color_utilities: ">=0.2.0 <0.11.1"
+  material_color_utilities: ">=0.2.0 <= 0.11.1"
 
 dev_dependencies:
   cider: ">=0.1.3 <0.3.0"