bump requires-python to include 3.13

Author: rwedge

pyproject.toml

@@ -18,7 +18,7 @@ classifiers = [
 keywords = [ 'copulas' ]
 dynamic = ["version"]
 license = { text = 'BSL-1.1' }
-requires-python = '>=3.8,<3.13'
+requires-python = '>=3.8,<3.14'
 readme = 'README.md'
 dependencies = [
     "numpy>=1.21.0;python_version<'3.10'",