Add python 3.13 support

Author: sanders41

.github/workflows/testing.yaml

@@ -40,7 +40,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        python-version: ["3.9", "3.10", "3.11", "3.12", "3.13-dev"]
+        python-version: ["3.9", "3.10", "3.11", "3.12", "3.13"]
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v4

pyproject.toml

@@ -17,6 +17,7 @@ classifiers=[
   "Programming Language :: Python :: 3.10",
   "Programming Language :: Python :: 3.11",
   "Programming Language :: Python :: 3.12",
+  "Programming Language :: Python :: 3.13",
   "License :: OSI Approved :: MIT License",
   "Operating System :: OS Independent",
   "Typing :: Typed",