setup.cfg: add py3.11, drop py3.6

Author: flit

setup.cfg

@@ -22,11 +22,11 @@ classifiers =
     Operating System :: POSIX
     Operating System :: Unix
     Programming Language :: Python
-    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
     Topic :: System :: Hardware :: Universal Serial Bus (USB)
     Typing :: Typed
 project_urls =
@@ -37,9 +37,7 @@ project_urls =
 
 [options]
 packages = find:
-install_requires =
-    importlib_resources; python_version < "3.7"
-python_requires = >=3.6
+python_requires = >=3.7
 include_package_data = True
 package_dir =
     =src