feat: update Python version to 3.9+

Author: hsluoyz

setup.py

@@ -36,11 +36,10 @@
     python_requires=">=3.3",
     license="Apache 2.0",
     classifiers=[
-        "Programming Language :: Python :: 3.5",
-        "Programming Language :: Python :: 3.6",
-        "Programming Language :: Python :: 3.7",
-        "Programming Language :: Python :: 3.8",
         "Programming Language :: Python :: 3.9",
+        "Programming Language :: Python :: 3.10",
+        "Programming Language :: Python :: 3.11",
+        "Programming Language :: Python :: 3.12",
         "License :: OSI Approved :: Apache Software License",
         "Operating System :: OS Independent",
     ],