V3.1: Temporarily remove PathType invariant

Since the PathType does not follow RFC 8089
anymore, but the `matches_xs_any_URI()`
method produces non-compliant XSD (see #317),
as a temporary fix to allow compliant XSD schema
generation, we remove the invariant completely.

aas_core_meta/v3_1.py

@@ -1384,18 +1384,9 @@ class Content_type(Non_empty_XML_serializable_string, DBC):
     """
 
 
-@invariant(
-    lambda self: matches_RFC_8089_path(self),
-    "The value must represent a valid file URI scheme according to RFC 8089.",
-)
 class Path_type(Identifier, DBC):
     """
     Identifier
-
-    .. note::
-
-        Any string conformant to RFC8089 , the “file” URI scheme (for
-        relative and absolute file paths)
     """
 
     pass