fix: Red error text contrast issue in Carbon 90 theme

Fixed by changing --color-base08 to #FF767C

Fixes #3096

Author: myan9

packages/builder/examples/build-configs/default/theme/css/themes/carbon-gray90.css

@@ -8,7 +8,7 @@ body[kui-theme="Carbon Gray90"][kui-theme-style] {
   --color-base05: #adadad;
   --color-base06: #f3f3f3;
   --color-base07: #fff;
-  --color-base08: #fb4b53;
+  --color-base08: #ff767c;
   --color-base09: #bf5b17;
   --color-base0A: #fdd13a;
   --color-base0B: #56d679;