chore: add builtin lxml to root dependencies

Author: RobBrazier

pyproject.toml

@@ -5,7 +5,10 @@ description = "Add your description here"
 readme = "README.md"
 authors = [{ name = "Rob Brazier", email = "git+github@brzr.co" }]
 requires-python = ">=3.9"
-dependencies = ["pyqt5>=5.15.11"]
+dependencies = [
+    "lxml>=5.4.0",
+    "pyqt5>=5.15.11",
+]
 
 [tool.uv.workspace]
 members = ["plugins/*", "libs/*"]