Update Python requirements

Author: tcbegley

setup.py

@@ -44,12 +44,12 @@ def _get_long_description():
     classifiers=[
         "Framework :: Dash",
         "License :: OSI Approved :: Apache Software License",
-        "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",
+        "Programming Language :: Python :: 3.13",
     ],
     extras_require={"pandas": ["numpy", "pandas"]},
-    python_requires=">=3.8, <4",
+    python_requires=">=3.9, <4",
 )