Update pyproject.toml

Author: ryanhill1

pyproject.toml

@@ -17,10 +17,11 @@ classifiers = [
     "Natural Language :: English",
     "Programming Language :: Python",
     "Programming Language :: Python :: 3",
-    "Programming Language :: Python :: 3 :: Only",
     "Programming Language :: Python :: 3.10",
     "Programming Language :: Python :: 3.11",
     "Programming Language :: Python :: 3.12",
+    "Programming Language :: Python :: 3.13",
+    "Programming Language :: Python :: 3 :: Only",
     "Topic :: Scientific/Engineering",
     "Topic :: Scientific/Engineering :: Physics"
 ]