Issue #3100443 by heddn: Make tests functional w/ Drupal 9

tests/modules/csv_source_yield_test/csv_source_yield_test.info.yml

@@ -2,5 +2,6 @@ name: Source plugin using yield
 type: module
 package: Testing
 core: 8.x
+core_version_requirement: ^8 || ^9
 dependencies:
   - drupal:migrate

tests/modules/migrate_source_csv_test/migrate_source_csv_test.info.yml

@@ -2,6 +2,7 @@ name: Migrate Source CSV Test
 type: module
 package: Testing
 core: 8.x
+core_version_requirement: ^8 || ^9
 dependencies:
   - drupal:migrate
   - migrate_source_csv:migrate_source_csv