Update module core version requirements

recurring_events.info.yml

 name: 'Recurring Events'
 type: module
 description: 'Provides the ability to create recurring events'
-core: 8.x
-core_version_requirement: ^8 || ^9
+core_version_requirement: ^8.8 || ^9
 package: 'Recurring Events'
 dependencies:
   - drupal:datetime_range