fix(tests): failing unit test flowProperties (#13138)

Co-authored-by: nKwiatkowski <nkwiatkowski@kestra.io>

webserver/src/test/java/io/kestra/webserver/controllers/api/PluginControllerTest.java

@@ -167,7 +167,7 @@ class PluginControllerTest {
             Argument.mapOf(String.class, Object.class)
         );
 
-        assertThat((Map<String, Object>) doc.get("properties")).hasSize(23);
+        assertThat((Map<String, Object>) doc.get("properties")).hasSize(24);
         assertThat((List<String>) doc.get("required")).hasSize(3);
     }