hotfix for python 3.14 being selected for ci

Author: aeturrell

pyproject.toml

@@ -3,7 +3,7 @@ name = "python4ds"
 version = "1.0.4"
 description = "The online book that teaches you how to use Python for data science."
 readme = "README.md"
-requires-python = ">=3.12.0"
+requires-python = ">=3.12.0,<3.13"
 dependencies = [
     "beautifulsoup4>=4.12.3",
     "graphviz>=0.20.3",