Bump BAAS test server version

[cmelchior]

We should bump to the latest version of BAAS, but currently this will cause a failure in our test setup:

java.lang.IllegalArgumentException: HTTP error 500 : {"error":"error retrieving the client config: mongo: no documents in result","error_code":"DatasourceInternalError"}
at io.realm.admin.ServerAdmin.executeRequest(ServerAdmin.kt:65)
at io.realm.admin.ServerAdmin.setIsRecoveryModeEnabled(ServerAdmin.kt:298)
at io.realm.admin.ServerAdmin.triggerClientReset(ServerAdmin.kt:347)
at io.realm.admin.ServerAdmin.triggerClientReset$default(ServerAdmin.kt:323)
at io.realm.SyncSessionTests$clientReset_recoverUnsyncedChangesStrategy_recover$1.invoke(SyncSessionTests.kt:312)
at io.realm.SyncSessionTests$clientReset_recoverUnsyncedChangesStrategy_recover$1.invoke(SyncSessionTests.kt:289)
at io.realm.rule.BlockingLooperThread$TestThread.run(BlockingLooperThread.kt:380)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:462)
at java.util.concurrent.FutureTask.run(FutureTask.java:266)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1167)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:641)
at java.lang.Thread.run(Thread.java:920)

See https://ci.realm.io/blue/organizations/jenkins/realm%2Frealm-java/detail/PR-7850/3/tests