setup.py: Add Python 3.9-3.12 classifiers

This commit adds the classifiers for the Python versions from 3.9 to
3.12 since these versions have been tested to be compatible.

Signed-off-by: Stephanos Ioannidis <[email protected]>

Author: stephanosio

setup.py

@@ -90,6 +90,10 @@
         "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",
         "Programming Language :: Python :: Implementation :: CPython",
         "Programming Language :: Python :: Implementation :: PyPy",
     ]