Restrict Python version to <3.13

Author: miesgre

pyproject.toml

@@ -15,7 +15,7 @@ maintainers = [{ name = "Javi Palanca", email = "[email protected]" }]
 license = {text = "MIT"}
 readme = "README.rst"
 keywords = ["spade"]
-requires-python = ">=3.9"
+requires-python = ">=3.9, <3.13"
 classifiers = [
     "Development Status :: 5 - Production/Stable",
     "Intended Audience :: Developers",
@@ -65,4 +65,4 @@ indent-style = "space"
 skip-magic-trailing-comma = false
 
 [tool.ruff.lint.isort]
-known-first-party = ["spade"]
+known-first-party = ["spade"]