[APT-11103] Make clearCache synchronous and update lib #56
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https://scribdjira.atlassian.net/browse/APT-11103
clearCache() is causing deadlock on db and in order to prevent that from happening making this synchronous by adding a lock..
Part of cause to this crash - https://console.firebase.google.com/project/big-cumulus-91501/crashlytics/app/android:com.scribd.app.reader0/issues/bf4cfd2071696cdde1ae064655e666d8?time=last-seven-days&types=crash&sessionEventKey=67C3387C038B0001589C8DC9248946B0_2055328103151786369
