Remove funtion as not needed

Author: MarcialRosales

deps/rabbitmq_auth_backend_oauth2/src/uaa_jwt.erl

@@ -189,7 +189,3 @@ sub(DecodedToken) ->
 sub(DecodedToken, Default) ->
     maps:get(<<"sub">>, DecodedToken, Default).
 
--spec validate_introspected_token(map()) ->
-    {ok, map()} | {error, term()}.
-validate_introspected_token(_Token) ->
-    {error, not_implemented}.