[dart] Preserve inner generic type for Map<String, List<T>> deserialization#22717

wing328 merged 3 commits intoOpenAPITools:masterOpenAPITools/openapi-generator:masterfrom

EddieRydell:fix/dart-map-list-deserializationEddieRydell/openapi-generator:fix/dart-map-list-deserializationCopy head branch name to clipboard