Set metadata for Python 3.12 support

Signed-off-by: Salvatore Mesoraca <[email protected]>

Author: aiven-sal

setup.py

@@ -36,7 +36,7 @@
     author_email="[email protected]",
     python_requires=">=3.8",
     install_requires=[
-        'async-timeout>=4.0.3; python_full_version<"3.11.3"',
+        'async-timeout>=4.0.3; python_version<="3.12"',
     ],
     classifiers=[
         "Development Status :: 5 - Production/Stable",
@@ -51,6 +51,7 @@
         "Programming Language :: Python :: 3.9",
         "Programming Language :: Python :: 3.10",
         "Programming Language :: Python :: 3.11",
+        "Programming Language :: Python :: 3.12",
         "Programming Language :: Python :: Implementation :: CPython",
         "Programming Language :: Python :: Implementation :: PyPy",
     ],