update imports for React 18

Change-Id: Ibc75ce532003a478b31d5d85d84c83a017262041
diff --git a/client/src/components/MessageList.js b/client/src/components/MessageList.js
index 5ea46b5..a6084a7 100644
--- a/client/src/components/MessageList.js
+++ b/client/src/components/MessageList.js
@@ -1,5 +1,5 @@
 import dayjs from "dayjs"
-import React, { useMemo } from 'react'
+import { useMemo } from 'react'
 import dayOfYear from 'dayjs/plugin/dayOfYear'
 import isBetween from 'dayjs/plugin/isBetween'
 import { Stack } from "@mui/system"