Avoid ConcurrentModificationException of LocalBrokerData. (#7729)

Fixes #7719

### Motivation

Avoid ConcurrentModificationException of LocalBrokerData. The root cause is the `updateLocalBrokerData` method in the ModularLoadManagerImpl update the `lastStats` in the LocalBrokerData to a HashMap, it should be a concurrent map.

pulsar-broker/src/main/java/org/apache/pulsar/broker/service/PulsarStats.java

@@ -69,7 +69,7 @@ public class PulsarStats implements Closeable {
         this.nsStats = new NamespaceStats();
         this.clusterReplicationMetrics = new ClusterReplicationMetrics(pulsar.getConfiguration().getClusterName(),
                 pulsar.getConfiguration().isReplicationMetricsEnabled());
-        this.bundleStats = Maps.newHashMap();
+        this.bundleStats = Maps.newConcurrentMap();
         this.tempMetricsCollection = Lists.newArrayList();
         this.metricsCollection = Lists.newArrayList();
         this.brokerOperabilityMetrics = new BrokerOperabilityMetrics(pulsar.getConfiguration().getClusterName(),