Remove unused Cleaner

Signed-off-by: Thiago Henrique Hüpner <[email protected]>

Author: Thihup

appserver/microprofile/health-glassfish/src/main/java/org/glassfish/microprofile/health/service/CollectHealthChecksExtension.java

@@ -24,7 +24,6 @@
 import jakarta.enterprise.inject.spi.Extension;
 import jakarta.enterprise.inject.spi.ProcessBean;
 
-import java.lang.ref.Cleaner;
 import java.util.Collections;
 import java.util.HashSet;
 import java.util.Set;
@@ -44,9 +43,6 @@
 
 
 public class CollectHealthChecksExtension implements Extension {
-
-    private static final Cleaner CLEANER = Cleaner.create();
-
     private final HealthReporter service;
     private final Set<HealthCheckBeanAndKind> healthChecks = Collections.newSetFromMap(new ConcurrentHashMap<>());
     private final InvocationManager invocationManager;