test: unflake StatementTimeoutTest (#3692) #11105

Job	Run time
units (8)	3m 37s
units-with-multiplexed-session (11)	3m 25s
units-with-multiplexed-session (8)	4m 1s
units-with-multiplexed-session (17)	3m 23s
units (11)	3m 28s
units-with-multiplexed-session (21)	3m 24s
units (17)	3m 16s
windows	5m 28s
units (21)	3m 34s
clirr	1m 6s
dependencies (17)	1m 24s
lint	1m 13s
javadoc	2m 44s
	40m 3s

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