Bump gson from 2.8.5 to 2.8.9

Bumps [gson](https://github.com/google/gson) from 2.8.5 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-2.8.5...gson-parent-2.8.9)

---
updated-dependencies:
- dependency-name: com.google.code.gson:gson
  dependency-type: direct:production
...

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

Author: dependabot[bot]

pom.xml

@@ -136,7 +136,7 @@
         <rocketmq.version>4.5.2</rocketmq.version>
         <hyperscan.version>5.4.0-2.0.0</hyperscan.version>
         <platform.version>3.5.2</platform.version>
-        <gson.version>2.8.5</gson.version>
+        <gson.version>2.8.9</gson.version>
         <java-grok.version>0.1.9</java-grok.version>
         <jython.version>2.7.0</jython.version>
         <scala-library.version>2.12.4</scala-library.version>