Bump gson from 2.8.8 to 2.8.9

Bumps [gson](https://github.com/google/gson) from 2.8.8 to 2.8.9.
- [Release notes](https://github.com/google/gson/releases)
- [Changelog](https://github.com/google/gson/blob/master/CHANGELOG.md)
- [Commits](google/gson@gson-parent-2.8.8...gson-parent-2.8.9)

---
updated-dependencies:
- dependency-name: com.google.code.gson:gson
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

pom.xml

@@ -160,7 +160,7 @@
         <sonar.coverage.jacoco.xmlReportPaths>target/jacoco-merged-reports/jacoco.xml</sonar.coverage.jacoco.xmlReportPaths>
         <sonar.junit.reportPaths>target/surefire-reports,target/failsafe-reports</sonar.junit.reportPaths>
         <!-- By default, the argLine is empty-->
-        <gson.version>2.8.8</gson.version>
+        <gson.version>2.8.9</gson.version>
         <argLine/>
         <!-- whether enable compiling the cpp client-->
         <client-cpp>false</client-cpp>