Grails 7 - grails-spring-security Remaining Cleanup

[jdaugherty]

Issue description

3 issues still not resolved from the original merge:

1. notFound error in the SecuredControllerSpec - resolved with sitemesh2/3 updates
2. Documentation needs updated - maven coordinates have been updated
3. The quick start apps are still referencing the older Grails & micronaut

[jdaugherty]

@sbglasius Can we close this ticket due to #1155 ?