[fix](multi-catalog) SecureRandom is used to replace Random in Federa…

…tionBackendPolicy to enhance security (apache#24860)

fe/fe-core/src/main/java/org/apache/doris/planner/external/FederationBackendPolicy.java

@@ -41,19 +41,19 @@
 import org.apache.logging.log4j.Logger;
 
 import java.nio.charset.StandardCharsets;
+import java.security.SecureRandom;
 import java.util.Collection;
 import java.util.Collections;
 import java.util.List;
 import java.util.Map;
-import java.util.Random;
 import java.util.Set;
 import java.util.stream.Collectors;
 
 public class FederationBackendPolicy {
     private static final Logger LOG = LogManager.getLogger(FederationBackendPolicy.class);
     private final List<Backend> backends = Lists.newArrayList();
     private final Map<String, List<Backend>> backendMap = Maps.newHashMap();
-    private final Random random = new Random(System.currentTimeMillis());
+    private final SecureRandom random = new SecureRandom();
     private ConsistentHash<TScanRangeLocations, Backend> consistentHash;
 
     private int nextBe = 0;