chore(setup): update python version requirement from 3.8 to 3.9

- Increased the minimum Python version requirement in setup.py to ensure compatibility with newer features and improvements.
- This change helps maintain the project's dependency on more recent Python versions, enhancing performance and security.

setup.py

@@ -35,7 +35,7 @@
         "License :: OSI Approved :: MIT License",
         "Operating System :: OS Independent",
     ],
-    python_requires='>=3.8',
+    python_requires='>=3.9',
     include_package_data=True,
     package_data={
         '': ['*.dll', '*.dylib', '*.so', '*.json'],