Avoid running tests on macos-13 runner (#20155)

Author: hauntsaninja

.github/workflows/test.yml

@@ -79,12 +79,18 @@ jobs:
         #   # allow_failure: true
         #   test_mypyc: true
 
-        - name: mypyc runtime tests with py39-macos
-          python: '3.9.21'
-          # TODO: macos-13 is the last one to support Python 3.9, change it to macos-latest when updating the Python version
-          os: macos-13
+        - name: mypyc runtime tests with py313-macos
+          python: '3.13'
+          os: macos-latest
           toxenv: py
           tox_extra_args: "-n 3 mypyc/test/test_run.py mypyc/test/test_external.py"
+
+        - name: mypyc runtime tests with py313-ubuntu
+          python: '3.13'
+          os: ubuntu-latest
+          toxenv: py
+          tox_extra_args: "-n 3 mypyc/test/test_run.py mypyc/test/test_external.py"
+
         # This is broken. See
         # - https://github.com/python/mypy/issues/17819
         # - https://github.com/python/mypy/pull/17822