Drop Python 3.8 support

setup/launchpad_setup.cfg

@@ -11,7 +11,6 @@ license_files = LICENSE.md
 license = GNU General Public License v3
 classifiers =
     Programming Language :: Python :: 3 :: Only
-    Programming Language :: Python :: 3.8
     Programming Language :: Python :: 3.9
     Programming Language :: Python :: 3.10
     Programming Language :: Python :: 3.11
@@ -30,7 +29,7 @@ project_urls =
 
 [options]
 zip_safe = False
-python_requires = >=3.8
+python_requires = >=3.9
 include_package_data = True
 packages = find_namespace:
 install_requires =