Update pyproject.toml

pyproject.toml

@@ -24,7 +24,7 @@ classifiers = [
 [tool.poetry.dependencies]
 python = "^3.8"
 minisignxml = ">=22.4"
-lxml = "^5.2"
+lxml = "^5.0"
 yarl = ">=1.4.2"
 # poetry doesn't support extras in dev-dependencies, so these must be here as optional dependencies
 Sphinx = { version = "^5", optional = true }