refactoring: used const instead of String

application/src/main/java/org/thingsboard/server/service/install/update/DefaultCacheCleanupService.java

@@ -27,6 +27,8 @@ import org.springframework.stereotype.Service;
 import java.util.Objects;
 import java.util.Optional;
 
+import static org.thingsboard.server.common.data.CacheConstants.SECURITY_SETTINGS_CACHE;
+
 @RequiredArgsConstructor
 @Service
 @Profile("install")
@@ -88,7 +90,7 @@ public class DefaultCacheCleanupService implements CacheCleanupService {
                 break;
             case "3.6.1":
                 log.info("Clearing cache to upgrade from version 3.6.1 to 3.6.2");
-                clearCacheByName("securitySettings");
+                clearCacheByName(SECURITY_SETTINGS_CACHE);
                 break;
             default:
                 //Do nothing, since cache cleanup is optional.