fix String.format lack of arg which is from BroadcastClusterInvoker

[xiaoheng1]

What is the purpose of the change

String.format lack of arg which is from BroadcastClusterInvoker

see #8341

Brief changelog

Verifying this change

Checklist

• Make sure there is a GitHub_issue field for the change (usually before you start working on it). Trivial changes like typos do not require a GitHub issue. Your pull request should address just this issue, without pulling in other changes - one PR resolves one issue.
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• Add some description to dubbo-website project if you are requesting to add a feature.
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• If this contribution is large, please follow the Software Donation Guide.

[codecov-commenter]

Codecov Report

Merging #8348 (8b5923e) into master (41e989b) will increase coverage by 0.00%.
The diff coverage is 0.00%.

@@            Coverage Diff            @@
##             master    #8348   +/-   ##
=========================================
  Coverage     61.26%   61.26%           
  Complexity      447      447           
=========================================
  Files          1096     1096           
  Lines         44212    44212           
  Branches       6445     6445           
=========================================
+ Hits          27085    27087    +2     
+ Misses        14146    14141    -5     
- Partials       2981     2984    +3     

Impacted Files	Coverage Δ
...o/rpc/cluster/support/BroadcastClusterInvoker.java	0.00% <0.00%> (ø)
.../dubbo/remoting/transport/netty4/NettyChannel.java	61.38% <0.00%> (-2.98%)	⬇️
...pache/dubbo/registry/support/AbstractRegistry.java	78.14% <0.00%> (-1.49%)	⬇️
...ng/zookeeper/curator5/Curator5ZookeeperClient.java	52.87% <0.00%> (-1.15%)	⬇️
...apache/dubbo/common/extension/ExtensionLoader.java	81.10% <0.00%> (ø)
...ng/transport/dispatcher/all/AllChannelHandler.java	89.65% <0.00%> (ø)
...g/apache/dubbo/registry/consul/ConsulRegistry.java	60.58% <0.00%> (+0.58%)	⬆️
...ting/zookeeper/curator/CuratorZookeeperClient.java	70.11% <0.00%> (+1.14%)	⬆️
...ting/exchange/support/header/HeartbeatHandler.java	93.02% <0.00%> (+2.32%)	⬆️
...etadata/report/support/AbstractMetadataReport.java	59.70% <0.00%> (+3.39%)	⬆️

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[pinxiong]

LGTM

[BurningCN]

LGTM