Upgrade Lektor to 3.4.0b13 for Werkzeug 3.x compatibility (#35)

Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: JoshKarpel <7133863+JoshKarpel@users.noreply.github.com>

Author: Copilot

pyproject.toml

@@ -4,4 +4,4 @@ version = "2025.1.3"
 description = "MadPy website"
 readme = "README.md"
 requires-python = ">=3.13"
-dependencies = ["Lektor"]
+dependencies = ["Lektor>=3.4.0b9"]