Issue #3175029 by Sam152, ericpugh: Drupal 9 Compatibility

json_ld_schema.info.yml

 name: JSON LD Schema API
 type: module
 description: An opinionated developer-centric API focused module for defining JSON LD objects in the Schema.org vocabulary.
-core: 8.x
+core_version_requirement: ^8 || ^9

tests/module/json_ld_schema_test_sources/json_ld_schema_test_sources.info.yml

 name: JSON LD Schema Test Sources
 type: module
 description: JSON LD Schema test sources.
-core: 8.x
+package: Testing
 
 dependencies:
   - json_ld_schema