Update supported Python versions

Author: asmeurer

setup.py

@@ -15,14 +15,14 @@
     long_description_content_type="text/markdown",
     url="https://data-apis.org/array-api-strict/",
     license="MIT",
-    python_requires=">=3.8",
+    python_requires=">=3.9",
     install_requires=["numpy"],
     classifiers=[
         "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 :: 3.12",
         "License :: OSI Approved :: BSD License",
         "Operating System :: OS Independent",
     ],