:fix: set hikari configuration pool to fixed size (more performant) #2596

Job	Run time
Build	5m 16s
test-broker	26m 12s
test-tag	2m 25s
test-brokerAcl	17m 8s
test-connection	14m 6s
test-datastore	15m 19s
test-device	4m 46s
test-device-management	15m 20s
test-jobsIntegrationBase	9m 18s
test-security	5m 38s
test-user	3m 52s
test-userIntegration	8m 17s
test-userIntegrationBase	7m 50s
test-accountAndTranslator	6m 26s
test-jobEngineRestartOfflineDevice	10m 12s
test-jobEngineRestartOnlineDevice	11m 45s
test-jobEngineStartOfflineDevice	11m 7s
test-jobEngineStartOnlineDevice	12m 26s
test-jobEngineStepDefinitions	8m 4s
test-jobsAndScheduler	2m 52s
test-jobsIntegration	9m 31s
build-javadoc	10m 20s
junit-tests	9m 2s
test-api-auth	6m 52s
test-deviceRegistry	12m 8s
test-endpoint	7m 57s
test-jobEngineRestartOnlineDeviceSecondPart	10m 29s
test-jobEngineServiceStop	13m 47s
test-RoleAndGroup	2m 52s
test-api-corsfilter	6m 52s
	4h 48m 9s

Provide feedback