improve: increase bounded cache IT GC timeout #5129

Job	Run time
sample_operators_tests (sample-operators/leader-election)	2m 58s
sample_operators_tests (sample-operators/tomcat-operator)	2m 22s
sample_operators_tests (sample-operators/mysql-schema)	2m 38s
sample_operators_tests (sample-operators/webpage)	2m 50s
	10m 48s

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