chore: update python support in setup.cfg, update ci matrix

* update classifiers in setup.cfg
* ci test with python 3.8-3.12
* drop python 3.7 since it's EOL

.github/workflows/test.yml

@@ -39,7 +39,7 @@ jobs:
       fail-fast: false
       matrix:
         os: [ubuntu-latest]
-        python: ["3.7", "3.8", "3.9", "3.10", "3.11-dev"]
+        python: ["3.8", "3.9", "3.10", "3.11", "3.12"]
 
     steps:
       - name: Checkout code

setup.cfg

@@ -13,10 +13,11 @@ classifiers =
     Topic :: Software Development :: Quality Assurance
     License :: OSI Approved :: GNU General Public License v3 (GPLv3)
     Programming Language :: Python :: 3
-    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
     Environment :: Console
     Operating System :: OS Independent
 keywords =
@@ -28,10 +29,9 @@ project_urls =
 
 [options]
 packages = find:
-python_requires = >= 3.6
+python_requires = >= 3.8
 install_requires =
     configargparse
-    importlib-metadata; python_version < "3.8"
 
 [options.entry_points]
 console_scripts =