fix(python): update to latest Python 3.13 (#389)

This app's dependencies do not work with Python 3.14's new async event loop changes, so I am setting the upper version limit to 3.13.

Reviewed-on: #389

pyproject.toml

@@ -6,7 +6,7 @@ readme = "README.md"
 authors = [
     {name = "Luke Tainton", email = "luke@tainton.uk"},
 ]
-requires-python = "<4.0,>=3.11"
+requires-python = "<3.14,>=3.11"
 dependencies = [
     "webex-bot<1.1.0,>=1.0.3",
     "datetime<6.0,>=5.5",