Issue #3111394 by heddn: Restore core key, or update version requirement

migrate_example/migrate_example.info.yml

...mple/migrate_example_setup/migrate_example_setup.info.yml

migrate_example_advanced/migrate_example_advanced.info.yml

...le_advanced_setup/migrate_example_advanced_setup.info.yml

migrate_json_example/migrate_json_example.info.yml

migrate_plus.info.yml

tests/modules/migrate_plus_test/migrate_plus_test.info.yml