Remove redundant async-timeout dependency in modern Python (#3177)

#3174

setup.py

@@ -36,7 +36,7 @@
     author_email="oss@redis.com",
     python_requires=">=3.8",
     install_requires=[
-        'async-timeout>=4.0.3',
+        'async-timeout>=4.0.3; python_full_version<"3.11.3"',
     ],
     classifiers=[
         "Development Status :: 5 - Production/Stable",