SpringBoot Migrate to common concourse-release-scripts

I think we can remove our own in favor of https://github.com/spring-io/concourse-release-scripts

Comment From: wilkinsona

https://github.com/wilkinsona/spring-boot/tree/gh-32577

We need an 0.4.0 release to pick up some enhancements:

• https://github.com/spring-io/concourse-release-scripts/issues/27
• https://github.com/spring-io/concourse-release-scripts/issues/28