Remove the forced conversion in the ServiceInstanceMetadataCustomizer#customize method

[BurningCN]

What is the purpose of the change

Remove the forced conversion in the ServiceInstanceMetadataCustomizer#customize method

[codecov-commenter]

Codecov Report

Merging #7870 (ad256fb) into master (e845e16) will increase coverage by 0.27%.
The diff coverage is 0.00%.

@@             Coverage Diff              @@
##             master    #7870      +/-   ##
============================================
+ Coverage     59.28%   59.55%   +0.27%     
- Complexity      529      557      +28     
============================================
  Files          1077     1088      +11     
  Lines         43565    43853     +288     
  Branches       6368     6400      +32     
============================================
+ Hits          25826    26116     +290     
+ Misses        14879    14839      -40     
- Partials       2860     2898      +38     

Impacted Files	Coverage Δ
...nt/metadata/ServiceInstanceMetadataCustomizer.java	0.00% <0.00%> (ø)
.../dubbo/remoting/transport/MultiMessageHandler.java	80.00% <0.00%> (-20.00%)	⬇️
...bo/rpc/cluster/support/FailbackClusterInvoker.java	52.45% <0.00%> (-18.04%)	⬇️
...ting/exchange/support/header/HeartbeatHandler.java	83.72% <0.00%> (-9.31%)	⬇️
...va/org/apache/dubbo/rpc/support/ProtocolUtils.java	61.53% <0.00%> (-8.03%)	⬇️
...dubbo/remoting/exchange/support/DefaultFuture.java	80.34% <0.00%> (-6.84%)	⬇️
...o/remoting/transport/ChannelHandlerDispatcher.java	64.00% <0.00%> (-6.00%)	⬇️
...apache/dubbo/rpc/protocol/injvm/InjvmProtocol.java	72.22% <0.00%> (-5.56%)	⬇️
.../threadpool/manager/DefaultExecutorRepository.java	80.95% <0.00%> (-4.54%)	⬇️
.../rpc/protocol/dubbo/LazyConnectExchangeClient.java	49.45% <0.00%> (-4.40%)	⬇️
... and 98 more

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