Update tox coverage command

Author: rmk135

tox.ini

@@ -26,7 +26,7 @@ python_files = test_*_py3*.py
 
 [testenv:coveralls]
 passenv = GITHUB_*, COVERALLS_*, DEPENDENCY_INJECTOR_*
-basepython=python3.12
+basepython=python3.13
 deps=
     {[testenv]deps}
     cython>=3,<4