Update test matrix

Author: astrofrog

.github/workflows/test_tox.yml

@@ -19,6 +19,6 @@ jobs:
     uses: ./.github/workflows/tox.yml
     with:
       envs: |
-        - linux: py313-linux-freethreaded
-        - macos: py313-linux-freethreaded
-        - windows: py313-linux-freethreaded
+        - linux: py313t-linux
+        - macos: py313t-linux
+        - windows: py313t-linux