Merge pull request #1018 from bosch-io/fix_migration_to_new_spring_boot_version

Update Spring Boot to 2.3.7.RELEASE

hawkbit-repository/hawkbit-repository-jpa/src/main/resources/hawkbit-jpa-defaults.properties

@@ -12,6 +12,7 @@ spring.main.allow-bean-definition-overriding=true
 ### JPA / Datasource - START
 spring.jpa.database=H2
 spring.jpa.show-sql=false
+spring.datasource.url=jdbc:h2:mem:testdb;MODE=MySQL;
 # Logging
 spring.datasource.eclipselink.logging.logger=JavaLogger
 spring.jpa.properties.eclipselink.logging.level=off