style: clean-up dead-code

Signed-off-by: Silvano Cirujano Cuesta <silvano.cirujano-cuesta@siemens.com>

Author: Silvanoc

linkml_runtime/utils/metamodelcore.py

@@ -144,10 +144,6 @@ def __init__(self, v: str) -> None:
             raise ValueError(f"'{v}': is not a valid URI")
         super().__init__(v)
 
-    # this is more inclusive than the W3C specification
-    #uri_re = re.compile("^[A-Za-z]\\S*$")
-    uri_re = re.compile("^\\S+$")
-
     @classmethod
     def is_valid(cls, v: str) -> bool:
         if validate_uri(v):