Bump the number of retries in transaction failures #2699
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This can potentially help even more with serializable transaction failures (optimistic locking exceptions, which are expected to occur somewhat frequently).
With six attempts, we will sleep at most five times, for 100+200+400+800+1600 ms each, for a total of at most 3.1 seconds (much less than the EPP maximum which I believe (?) to be 30 seconds.
This change is