SpringBoot Revert changes made for GraalVM in EmbeddedDatabaseConnection

https://github.com/spring-projects/spring-boot/issues/32865 changed the EmbeddedDatabaseConnection so that GraalVM would not fail to initialize it.

When https://github.com/oracle/graal/issues/5300 and https://github.com/oracle/graal/issues/5301 is resolved, we can revert these changes.