Upgrade phpunit to 9.4 (#2617)

Author: limingxinleo

composer.json

@@ -27,7 +27,7 @@
         "hyperf/di": "~2.1.0",
         "malukenho/docheader": "^0.1.6",
         "mockery/mockery": "^1.0",
-        "phpunit/phpunit": "^7.0.0",
+        "phpunit/phpunit": "^9.4",
         "friendsofphp/php-cs-fixer": "^2.9"
     },
     "suggest": {

tests/Lua/EvalTest.php

@@ -24,7 +24,7 @@
  */
 class EvalTest extends TestCase
 {
-    protected function tearDown()
+    protected function tearDown(): void
     {
         $container = ContainerStub::mockContainer();
         $redis = $container->get(\Redis::class);

tests/Lua/HashTest.php

@@ -24,7 +24,7 @@
  */
 class HashTest extends TestCase
 {
-    protected function tearDown()
+    protected function tearDown(): void
     {
         $container = ContainerStub::mockContainer();
         $redis = $container->get(\Redis::class);

tests/RedisConnectionTest.php

@@ -29,7 +29,7 @@
  */
 class RedisConnectionTest extends TestCase
 {
-    public function tearDown()
+    protected function tearDown(): void
     {
         Mockery::close();
     }

tests/RedisProxyTest.php

@@ -31,7 +31,7 @@
  */
 class RedisProxyTest extends TestCase
 {
-    protected function tearDown()
+    protected function tearDown(): void
     {
         $redis = $this->getRedis();
         $redis->flushDB();

tests/RedisTest.php

@@ -34,7 +34,7 @@
  */
 class RedisTest extends TestCase
 {
-    public function tearDown()
+    protected function tearDown(): void
     {
         Mockery::close();
         Context::set('redis.connection.default', null);