5.x fatal error creating new severs

Problem/Motivation

Create a new server, get fatal error

TypeError: Cannot assign string to property Drupal\graphql\Entity\Server::$query_depth of type ?int in Drupal\Core\Config\Entity\ConfigEntityBase->set() (line 173 of core/lib/Drupal/Core/Config/Entity/ConfigEntityBase.php).

Steps to reproduce

1. /admin/config/graphql/servers/create
2. Add label
3. Add endpoint (eg /testing123)
4. Click save

Proposed resolution

web/modules/contrib/graphql/src/Form/ServerForm.php
copyFormValuesToEntity()

  $form_state->setValue('query_depth', (int) $form_state->getValue('query_depth') ?: NULL);
  $form_state->setValue('query_complexity', (int) $form_state->getValue('query_complexity') ?: NULL);

query_depth and query_complexity should possibly be nullable in the schema yml also?

Remaining tasks

User interface changes

API changes

Data model changes