Remove py13 test

Author: evhub

.github/workflows/run-tests.yml

@@ -14,7 +14,6 @@ jobs:
           - '3.10'
           - '3.11'
           - '3.12'
-          - '3.13'
           - 'pypy-2.7'
           - 'pypy-3.6'
           - 'pypy-3.7'