fix: update autoconfigure package names for Spring Boot 4 and fix CodeNarc violation

Update ApplicationClassInjectorSpec test expectations to match Spring
Boot 4 relocated autoconfigure packages (jdbc, reactor, hibernate).
Remove consecutive blank line in GrailsGradlePlugin left from the
LoaderImplementation removal.

Assisted-by: Claude Code <Claude@Claude.ai>

Author: jamesfredley

grails-core/src/test/groovy/org/grails/compiler/injection/ApplicationClassInjectorSpec.groovy

@@ -32,9 +32,9 @@ class ApplicationClassInjectorSpec extends Specification {
 
         where:
         className << [
-            'org.springframework.boot.autoconfigure.jdbc.DataSourceAutoConfiguration',
-            'org.springframework.boot.autoconfigure.reactor.ReactorAutoConfiguration',
-            'org.springframework.boot.autoconfigure.orm.jpa.HibernateJpaAutoConfiguration'
+            'org.springframework.boot.jdbc.autoconfigure.DataSourceAutoConfiguration',
+            'org.springframework.boot.reactor.autoconfigure.ReactorAutoConfiguration',
+            'org.springframework.boot.hibernate.autoconfigure.HibernateJpaAutoConfiguration'
         ]
     }
 

grails-gradle/plugins/src/main/groovy/org/grails/gradle/plugin/core/GrailsGradlePlugin.groovy

@@ -451,7 +451,6 @@ ${importStatements}
                 }
             }
 
-
         }
     }