Use new JSX transform in all sample and test suites

test/LocaleOptions.tsx

@@ -1,4 +1,4 @@
-import React, { useRef } from 'react';
+import { useRef } from 'react';
 
 type LocaleOptionsProps = {
   locale: string | undefined;

test/Test.tsx

@@ -1,4 +1,4 @@
-import React, { useCallback, useEffect, useState } from 'react';
+import { useCallback, useEffect, useState } from 'react';
 import Clock from 'react-clock';
 import 'react-clock/dist/Clock.css';
 import { useSetInterval } from '@wojtekmaj/react-hooks';

test/index.tsx

@@ -1,4 +1,4 @@
-import React, { StrictMode } from 'react';
+import { StrictMode } from 'react';
 import { createRoot } from 'react-dom/client';
 
 import Test from './Test.js';