update imports for React 18

Change-Id: Ibc75ce532003a478b31d5d85d84c83a017262041
diff --git a/client/src/components/Message.js b/client/src/components/Message.js
index 44d423a..e22d863 100644
--- a/client/src/components/Message.js
+++ b/client/src/components/Message.js
@@ -2,7 +2,7 @@
 import dayjs from "dayjs"
 import isToday from "dayjs/plugin/isToday"
 import isYesterday from "dayjs/plugin/isYesterday"
-import React from "react"
+import { useMemo } from "react";
 import { useTranslation } from "react-i18next"
 import ConversationAvatar from "./ConversationAvatar"
 
@@ -219,7 +219,7 @@
 const MessageBubble = (props) => {
   const largeRadius = "20px"
   const smallRadius = "5px"
-  const radius = React.useMemo(() => {
+  const radius = useMemo(() => {
     if (props.position == "start") {
       return {
         borderStartStartRadius: props.isFirstOfGroup ? largeRadius : smallRadius,