Update ci.yaml

Author: cpburnz

.github/workflows/ci.yaml

@@ -16,7 +16,7 @@ jobs:
       fail-fast: false
       matrix:
         os: [ubuntu, macos, windows]
-        python: ["3.8", "3.9", "3.10", "3.11", "3.12", "pypy-3.8", "pypy-3.9", "pypy-3.10"]
+        python: ["3.8", "3.9", "3.10", "3.11", "3.12", "3.13", "pypy-3.8", "pypy-3.9", "pypy-3.10", "pypy-3.11"]
 
     steps:
       - uses: actions/checkout@v4