Bump com.google.code.gson:gson from 2.8.6 to 2.8.9

Bumps [com.google.code.gson:gson](https://github.com/google/gson) from 2.8.6 to 2.8.9.
- [Release notes](https://github.com/google/gson/releases)
- [Changelog](https://github.com/google/gson/blob/main/CHANGELOG.md)
- [Commits](google/gson@gson-parent-2.8.6...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]>

pom.xml

@@ -17,7 +17,7 @@
     <logback.version>1.2.3</logback.version>
     <easymock.version>3.6</easymock.version>
     <truth.version>1.0.1</truth.version>
-    <gson.version>2.8.6</gson.version>
+    <gson.version>2.8.9</gson.version>
     <logging.version>1.98.0</logging.version>
     <guava.version>28.2-android</guava.version>
     <slf4j.version>1.7.30</slf4j.version>