[Dubbo-3903] Fix maven package error of dubbo-serialization-gson

[maoyiz]

What is the purpose of the change

fix #3903

Brief changelog

/dubbo-serialization/dubbo-serialization-gson/pom.xml

Verifying this change

mvn package

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[codecov-io]

Codecov Report

Merging #3904 into master will decrease coverage by 0.02%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##             master    #3904      +/-   ##
============================================
- Coverage     63.66%   63.63%   -0.03%     
  Complexity       71       71              
============================================
  Files           712      712              
  Lines         31450    31450              
  Branches       5073     5073              
============================================
- Hits          20023    20014       -9     
- Misses         9134     9136       +2     
- Partials       2293     2300       +7

Impacted Files	Coverage Δ	Complexity Δ
.../apache/dubbo/remoting/transport/AbstractPeer.java	58.69% <0%> (-13.05%)	0% <0%> (ø)
...che/dubbo/remoting/transport/mina/MinaChannel.java	43.42% <0%> (-10.53%)	0% <0%> (ø)
...ng/exchange/support/header/HeartbeatTimerTask.java	73.68% <0%> (-5.27%)	0% <0%> (ø)
...c/main/java/org/apache/dubbo/rpc/RpcException.java	82.75% <0%> (-3.45%)	0% <0%> (ø)
...pache/dubbo/registry/support/AbstractRegistry.java	78.92% <0%> (-2.69%)	0% <0%> (ø)
...exchange/support/header/HeaderExchangeHandler.java	62.2% <0%> (+2.36%)	0% <0%> (ø)	⬇️
.../apache/dubbo/qos/protocol/QosProtocolWrapper.java	69.23% <0%> (+5.12%)	0% <0%> (ø)	⬇️
.../org/apache/dubbo/remoting/ExecutionException.java	21.05% <0%> (+5.26%)	0% <0%> (ø)	⬇️
...ng/transport/dispatcher/all/AllChannelHandler.java	57.14% <0%> (+5.71%)	0% <0%> (ø)	⬇️
...apache/dubbo/common/config/ConfigurationUtils.java	72% <0%> (+8%)	0% <0%> (ø)	⬇️
... and 1 more

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[ralf0131]

LGTM, thanks for the pull request!