Remove py3.13 for now

Author: etpeterson

.github/workflows/unit_test.yml

@@ -11,7 +11,8 @@ jobs:
       fail-fast: false
       matrix:
         os: [ubuntu-latest, macos-latest, windows-latest]
-        python-version: ["3.9", "3.10", "3.11", "3.12", "3.13"]
+        python-version: ["3.9", "3.10", "3.11", "3.12"]
+        # Windows chokes on py3.13: https://github.com/numpy/numpy/issues/27894
         # exclude:
         #   - os: macos-latest
         #     python-version: "3.7"