Fix compile error

[biyuhao]

What is the purpose of the change

Fix compile error

Previous console output:

./mvnw clean install -DskipTests
[INFO] Scanning for projects...
[ERROR] [ERROR] Some problems were encountered while processing the POMs:
[FATAL] Non-resolvable parent POM for
org.apache.dubbo:dubbo-demo-xml-consumer:[unknown-version]: Could not find
artifact org.apache.dubbo:dubbo-demo:pom:2.7.0-SNAPSHOT and
'parent.relativePath' points at wrong local POM @ line 19, column 13
[WARNING] 'dependencies.dependency.(groupId:artifactId:type:classifier)'
must be unique: org.apache.dubbo:dubbo-metadata-definition:jar -> duplicate
declaration of version ${project.parent.version} @
org.apache.dubbo:dubbo-metadata-report-api:[unknown-version],
/root/codes/incubator-dubbo/dubbo-metadata-report/dubbo-metadata-report-api/pom.xml,
line 71, column 21
[WARNING] 'dependencies.dependency.(groupId:artifactId:type:classifier)'
must be unique: com.google.code.gson:gson:jar -> duplicate declaration of
version (?) @ org.apache.dubbo:dubbo-metadata-report-api:[unknown-version],
/root/codes/incubator-dubbo/dubbo-metadata-report/dubbo-metadata-report-api/pom.xml,
line 76, column 21

Brief changelog

modify dubbo-demo/dubbo-demo-xml/dubbo-demo-xml-consumer/pom.xml

Verifying this change

UT pass

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[codecov-io]

Codecov Report

Merging #3122 into master will decrease coverage by 0.12%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##             master    #3122      +/-   ##
============================================
- Coverage     63.67%   63.55%   -0.13%     
  Complexity       75       75              
============================================
  Files           652      652              
  Lines         28190    28190              
  Branches       4784     4784              
============================================
- Hits          17950    17915      -35     
- Misses         7989     8017      +28     
- Partials       2251     2258       +7

Impacted Files	Coverage Δ	Complexity Δ
.../apache/dubbo/qos/protocol/QosProtocolWrapper.java	69.23% <0%> (-12.83%)	0% <0%> (ø)
.../remoting/transport/netty4/NettyServerHandler.java	73.52% <0%> (-11.77%)	0% <0%> (ø)
...in/java/org/apache/dubbo/common/utils/JVMUtil.java	73.58% <0%> (-7.55%)	0% <0%> (ø)
...ng/transport/dispatcher/all/AllChannelHandler.java	51.42% <0%> (-5.72%)	0% <0%> (ø)
.../org/apache/dubbo/remoting/ExecutionException.java	15.78% <0%> (-5.27%)	0% <0%> (ø)
...onfig/spring/extension/SpringExtensionFactory.java	80.48% <0%> (-4.88%)	0% <0%> (ø)
...e/dubbo/remoting/transport/netty/NettyChannel.java	57.64% <0%> (-4.71%)	0% <0%> (ø)
.../apache/dubbo/remoting/transport/AbstractPeer.java	63.04% <0%> (-4.35%)	0% <0%> (ø)
...exchange/support/header/HeaderExchangeHandler.java	55.81% <0%> (-2.33%)	0% <0%> (ø)
...dubbo/remoting/exchange/support/DefaultFuture.java	73.15% <0%> (-2.02%)	0% <0%> (ø)
... and 3 more

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[ralf0131]

LGTM, thanks for the pull request!