chore(ci): Enable Python 3.13 tests

Author: effigies

.github/workflows/pythonpackage.yml

@@ -94,7 +94,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        python-version: ["3.9", "3.10", "3.11", "3.12"]
+        python-version: ["3.9", "3.10", "3.11", "3.12", "3.13"]
         dependencies: [latest, pre]
         include:
           - python-version: "3.9"

tox.ini

@@ -14,6 +14,7 @@ python =
   3.10: py310
   3.11: py311
   3.12: py312
+  3.13: py313
 
 [gh-actions:env]
 DEPENDS =
@@ -53,6 +54,8 @@ pass_env =
   CLICOLOR
   CLICOLOR_FORCE
   PYTHON_GIL
+deps =
+  py313: traits @ git+https://github.com/enthought/traits.git@10954eb
 extras = tests
 setenv =
   pre: PIP_EXTRA_INDEX_URL=https://pypi.anaconda.org/scientific-python-nightly-wheels/simple