Fix auth expires value larger than 32-bit integer for GraphQL (#17908)

* verify blackbox test catches this error

* use GraphQLBigInt for auth expires field

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Co-authored-by: Rijk van Zanten <rijkvanzanten@me.com>

api/src/services/graphql/index.ts

@@ -1825,7 +1825,7 @@ export class GraphQLService {
 			name: 'auth_tokens',
 			fields: {
 				access_token: GraphQLString,
-				expires: GraphQLInt,
+				expires: GraphQLBigInt,
 				refresh_token: GraphQLString,
 			},
 		});