Bug fixes

• Fixed hostname for Wikipedia service configuration

Fixed issue #3192456 - "PHP message: Uncaught PHP Exception LogicException: "You are not allowed to use js, css in #attached."

Issue #3136532 by sarvjeetsingh, bonus: Drupal 9 readiness

• Gracefully handle wrong version of Sentry SDK installed rather than throwing fatal error

Note: Some settings, such as SSL verification and timeout, are not available in the 3.x branch, due to client options being removed from the SDK. If you need these settings, you may want to continue using the 8.x-2.x branch of this module, or contributions to the SDK and/or this module are welcome :)

Updated API code to use `entity->validate` to stop possible overbooking issues that have been reported.