test against CPython 3.13

Author: altendky

.github/workflows/ci.yml

@@ -69,6 +69,7 @@ jobs:
               "3.10": docker://python:3.10-bookworm
               "3.11": docker://python:3.11-bookworm
               "3.12": docker://python:3.12-bookworm
+              "3.13": docker://python:3.13-bookworm
               "pypy2.7": docker://pypy:2.7-bookworm
               "pypy3.7": docker://pypy:3.7-bullseye
               "pypy3.8": docker://pypy:3.8-bookworm
@@ -142,6 +143,13 @@ jobs:
             docker: "3.12"
             implementation: cpython
             major: 3
+          - name: CPython 3.13
+            tox: py313
+            major-dot-minor: "3.13"
+            action: "3.13"
+            docker: "3.13"
+            implementation: cpython
+            major: 3
 # disabled due to installation failures
 # https://github.com/pytest-dev/pytest-twisted/pull/157
 #           - name: PyPy 2.7