Fix Button and IconButton RSC compatibility (#2982)

Author: connor-baer

.changeset/happy-singers-judge.md

@@ -0,0 +1,5 @@
+---
+"@sumup-oss/circuit-ui": patch
+---
+
+Fixed the Button and IconButton component's compatibility with React Server Components (RSC) by adding a missing `'use client'` directive.

packages/circuit-ui/components/Button/Button.tsx

@@ -13,6 +13,8 @@
  * limitations under the License.
  */
 
+'use client';
+
 import type {
   ForwardRefExoticComponent,
   PropsWithoutRef,

packages/circuit-ui/components/Button/IconButton.tsx

@@ -13,6 +13,8 @@
  * limitations under the License.
  */
 
+'use client';
+
 import {
   Children,
   cloneElement,