Drop support for python 3.6 and 3.7

Signed-off-by: Keshav Priyadarshi <git@keshav.space>

Author: keshav-space

setup.cfg

@@ -16,11 +16,11 @@ classifiers =
     Intended Audience :: Developers
     Programming Language :: Python :: 3
     Programming Language :: Python :: 3 :: Only
-    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
     Topic :: Software Development
     Topic :: Utilities