Merge pull request #15625 from a110605/fix_warning_text_color

fix: warning text color is not obvious in dark mode

Author: a110605

shell/assets/styles/themes/_modern.scss

@@ -1058,7 +1058,7 @@ BODY, .theme-dark {
   --rc-disabled-text-color: #{$gray004};
 
   --error-text    : #FFAC99;
-  --warning-text  : #{$warning};
+  --warning-text  : #{contrast-color($warning)};;
 
   --success-badge     : #{rgba($success, 10%)};
   --on-success-banner : #00B752;