Add org.json:json to managed third-party dependencies

[chingor13]

google-cloud-bigquerystorage is managing this version itself and this is a hurdle for the monorepo migration

https://github.com/googleapis/java-bigquerystorage/blob/976594094b5db302446f86cbc1ad8774417bfd58/pom.xml#L138-L142