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] <support@github.com>

pom.xml

@@ -58,7 +58,7 @@
 
         <android.version>4.1.1.4</android.version>
         <javaPoet.version>1.11.1</javaPoet.version>
-        <gson.version>2.8.5</gson.version>
+        <gson.version>2.8.9</gson.version>
         <jackson.version>2.12.6.1</jackson.version>
         <streamsupport.version>1.7.1</streamsupport.version>
         <annotations.version>4.1.1.4</annotations.version>