Drop Python 3.8 support

setup.py

@@ -51,7 +51,7 @@ setuptools.setup(
 
     install_requires=install_requires,
     extras_require=extras_require,
-    python_requires="~=3.8",
+    python_requires="~=3.9",
 
     classifiers=[
         "Development Status :: 4 - Beta",
@@ -60,9 +60,9 @@ setuptools.setup(
         "Framework :: AsyncIO",
         "Programming Language :: Python",
         "Programming Language :: Python :: 3",
-        "Programming Language :: Python :: 3.8",
         "Programming Language :: Python :: 3.9",
         "Programming Language :: Python :: 3.10",
+        "Programming Language :: Python :: 3.11",
     ],
     package_data={"mautrix_telegram": [
         "web/public/*.mako", "web/public/*.png", "web/public/*.css",