🐛(react) fix RadioGroup optional prop

since 5dde74c10d RadioGroup style was a
mandatory property.
It should be optional.

.changeset/chilled-brooms-leave.md

@@ -0,0 +1,5 @@
+---
+"@openfun/cunningham-react": minor
+---
+
+fix RadioGroup optional prop

packages/react/src/components/Forms/Radio/index.tsx

@@ -36,7 +36,7 @@ export const RadioGroup = ({
   text,
   rightText,
   style,
-}: PropsWithChildren & FieldProps & { style: React.CSSProperties }) => {
+}: PropsWithChildren & FieldProps & { style?: React.CSSProperties }) => {
   return (
     <Field
       className="c__radio__group c__checkbox__group"