Added missing classifiers for latest versions of python

Author: Sylvain MARIE

setup.cfg

@@ -28,6 +28,9 @@ classifiers =
  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
  Framework :: Pytest
 
 [options]