Drupal 10 compatibility

/src/EasychartUpdate.php
Relying on entity queries to check access by default is deprecated in drupal:9.2.0 and an error will be thrown from drupal:10.0.0. Call \Drupal\Core\Entity\Query\QueryInterface::accessCheck() with TRUE or FALSE to specify whether access should be checked.

/easychart.libraries.yml
The 'easychart.widget' library is depending on a deprecated library. The core/jquery.once asset library is deprecated in Drupal 9.3.0 and will be removed in Drupal 10.0.0. Use the core/once library instead. See https://www.drupal.org/node/3158256
The 'easychart.render' library is depending on a deprecated library. The core/jquery.once asset library is deprecated in Drupal 9.3.0 and will be removed in Drupal 10.0.0. Use the core/once library instead. See https://www.drupal.org/node/3158256
The 'easychart.admin' library is depending on a deprecated library. The core/jquery.once asset library is deprecated in Drupal 9.3.0 and will be removed in Drupal 10.0.0. Use the core/once library instead. See https://www.drupal.org/node/3158256
The 'highcharts.render' library is depending on a deprecated library. The core/jquery.once asset library is deprecated in Drupal 9.3.0 and will be removed in Drupal 10.0.0. Use the core/once library instead. See https://www.drupal.org/node/3158256

/easychart.info.yml
Value of core_version_requirement: ^8 || ^9 is not compatible with the next major version of Drupal core. See https://drupal.org/node/3070687.

/composer.json
The drupal/core requirement is not compatible with the next major version of Drupal. Either remove it or update it to be compatible. See https://drupal.org/node/2514612#s-drupal-9-compatibility.