support python 3.12

...and drop support for 3.9. Also drop all the release qualifiers,
hopefully nobody pays attention to these.

Signed-off-by: Tycho Andersen <tycho@tycho.pizza>

.github/workflows/ci.yaml

@@ -13,7 +13,7 @@ jobs:
         strategy:
             fail-fast: false
             matrix:
-                python-version: [3.9, "3.10", "3.11", "pypy3.9"]
+                python-version: ["3.10", "3.11", "3.12", "pypy3.9"]
                 xcbver: [xcb-proto-1.15.2, xcb-proto-1.16.0, master]
         steps:
             - uses: actions/checkout@v3

setup.py

@@ -75,10 +75,6 @@ def finalize_options(self):
         'Development Status :: 5 - Production/Stable',
         'License :: OSI Approved :: Apache Software License',
         'Programming Language :: Python :: 3',
-        'Programming Language :: Python :: 3.8',
-        'Programming Language :: Python :: 3.9',
-        'Programming Language :: Python :: 3.10',
-        'Programming Language :: Python :: 3.11',
         'Programming Language :: Python :: Implementation :: CPython',
         'Programming Language :: Python :: Implementation :: PyPy',
         'Topic :: Software Development :: Libraries'