Validator: use justinrainbow/json-schema validator
Since using the json validator from library Opis 2.x is blocked on WikiLambda migration T319054 use justinrainbow for consistency which is already a core dependency.
Bug: T348227 Bug: T353230
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Since using the json validator from library Opis 2.x is blocked on WikiLambda migration T319054 use justinrainbow for consistency which is already a core dependency.
Bug: T348227 Bug: T353230