Upgrade redis-py to 4.4.4 and above

Fix a redis-py asynchronous usage bug, for details
please refer to: redis/redis-py#2665

setup.py

@@ -13,5 +13,5 @@
     author_email="vincillau@outlook.com",
     python_requires=">=3.7",
     packages=["tair", "tair.asyncio"],
-    install_requires=["redis >= 4.2"],
+    install_requires=["redis >= 4.4.4"],
 )