fix: prevent H2 shutdown warnings by disabling DB_CLOSE_ON_EXIT

Author: sugan0tech

Diff for: vertical-slice-architecture/src/main/resources/application.properties

@@ -1,6 +1,6 @@
 spring.main.web-application-type=none
 #datasource settings
-spring.datasource.url=jdbc:h2:mem:testdb
+spring.datasource.url=jdbc:h2:mem:testdb;DB_CLOSE_ON_EXIT=FALSE
 spring.datasource.driverClassName=org.h2.Driver
 spring.datasource.username=sa
 spring.datasource.password=sa