fix(a11y): text color contrast (#17166)

As the textual paragraph get's an 80% opacity defined, the text colors contrast violates [Success Critera 1.4.3](https://www.w3.org/WAI/WCAG21/Understanding/contrast-minimum.html) that expects a color contrast of at least 4.5:1

packages/features/bookings/Booker/components/BookEventForm/BookEventForm.tsx

@@ -119,7 +119,7 @@ export const BookEventForm = ({
           </div>
         )}
         {!isPlatform && (
-          <div className="text-subtle my-3 w-full text-xs opacity-80">
+          <div className="text-subtle my-3 w-full text-xs">
             <Trans
               i18nKey="signing_up_terms"
               components={[