## 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
Follow this checklist to help us incorporate your contribution quickly and
easily:
- [x] Make sure there is a
[GITHUB_issue](https://github.com/apache/incubator-dubbo/issues) 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.
- [x] Format the pull request title like `[Dubbo-XXX] Fix UnknownException when
host config not exist #XXX`. Each commit in the pull request should have a
meaningful subject line and body.
- [x] Write a pull request description that is detailed enough to understand
what the pull request does, how, and why.
- [x] Write necessary unit-test to verify your logic correction, more mock a
little better when cross module dependency exist. If the new feature or
significant change is committed, please remember to add integration-test in
[test module](https://github.com/apache/incubator-dubbo/tree/master/dubbo-test).
- [x] Run `mvn clean install -DskipTests=false` & `mvn clean test-compile
failsafe:integration-test` to make sure unit-test and integration-test pass.
- [x] If this contribution is large, please follow the [Software Donation
Guide](https://github.com/apache/incubator-dubbo/wiki/Software-donation-guide).
[ Full content available at:
https://github.com/apache/incubator-dubbo/pull/3122 ]
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