added importlib dependencie for 3.8

pyproject.toml

@@ -12,7 +12,8 @@ requires-python = ">=3.8"
 dependencies = [
     "jinja2",
     "lxml",
-    "xmlschema"
+    "xmlschema",
+    "importlib_resources"  # Add this line to ensure compatibility with Python 3.8
 ]
 readme = {file = "README.md", content-type = "text/markdown"}