Spring Security Change gradle.plugin.org.gretty:gretty:3.0.1 to org.gretty:gretty:3.0.9

The buildSrc dependency gradle.plugin.org.gretty:gretty:3.0.1 is not resolved from the repo.spring.io plugins-release repository. This might be related to this incident from Gradle.

However, if we update the dependency to org.gretty:gretty:3.0.9, we are able to resolve it.