Issue #3296555 by Project Update Bot: Automated Drupal 10 compatibility fixes - adding d8 back in

ajax_loader.info.yml

 name: Ajax Loader
 type: module
 description: 'Provides alternative ajax loaders/throbbers.'
-core_version_requirement: ^9 || ^10
+core: '8.x'
+core_version_requirement: ^8 || ^9 || ^10
 package: 'User Interface'
 configure: ajax_loader.settings