fix(clients): userToken max length (#2004)

Author: kai687

specs/insights/common/schemas/EventAttributes.yml

@@ -19,7 +19,7 @@ index:
 userToken:
   type: string
   minLength: 1
-  maxLength: 128
+  maxLength: 129
   pattern: '[a-zA-Z0-9_=/+-]{1,129}'
   description: |
     Anonymous or pseudonymous user identifier.