Update shacl.ttl

needing to type the namespace URI so that it matches the definition  declaration at line 1142

Author: pwin

shacl/shacl.ttl

@@ -14,7 +14,7 @@ sh:
 	rdfs:comment "This vocabulary defines terms used in SHACL, the W3C Shapes Constraint Language."@en ;
 	sh:declare [
 		sh:prefix "sh" ;
-		sh:namespace "http://www.w3.org/ns/shacl#" ;
+		sh:namespace "http://www.w3.org/ns/shacl#"^^xsd:anyURI ;
 	] ;
 	sh:suggestedShapesGraph <http://www.w3.org/ns/shacl-shacl#> .