Set minimum Python version to 3.10

With using the type union syntax we will require atleast Python 3.10.
Also v3.8 and v3.9 have reached end of life.

Author: emanlove

setup.py

@@ -13,8 +13,6 @@
 Operating System :: OS Independent
 Programming Language :: Python
 Programming Language :: Python :: 3
-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