fix(composedmodal): do not run cleanup effect on every update (#11930)

Co-authored-by: Abbey Hart <abbeyhrt@gmail.com>
Co-authored-by: kodiakhq[bot] <49736102+kodiakhq[bot]@users.noreply.github.com>

Author: 3 people

packages/react/src/components/ComposedModal/ComposedModal.js

@@ -200,7 +200,7 @@ const ComposedModal = React.forwardRef(function ComposedModal(
   useEffect(() => {
     return () =>
       toggleClass(document.body, `${prefix}--body--with-modal-open`, false);
-  });
+  }, []); // eslint-disable-line react-hooks/exhaustive-deps
 
   useEffect(() => {
     toggleClass(document.body, `${prefix}--body--with-modal-open`, open);