Update Python version trove classifiers (#135)

Author: Andy-Grigg

pyproject.toml

@@ -18,10 +18,10 @@ classifiers = [
   "Topic :: Scientific/Engineering :: Information Analysis",
   "License :: OSI Approved :: MIT License",
   "Operating System :: OS Independent",
-  "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",
 ]
 packages = [{ include = "**/*.py", from = "src" }]