Bump utils version which contains ~ as an invalid first character for a

postal address.

app/notifications/validators.py

@@ -265,7 +265,7 @@ def validate_address(service, letter_data):
         )
     if address.has_invalid_characters:
         raise ValidationError(
-            message='Address lines must not start with any of the following characters: @ ( ) = [ ] ” \\ / , < >'
+            message='Address lines must not start with any of the following characters: @ ( ) = [ ] ” \\ / , < > ~'
         )
     if address.international:
         return address.postage