Bump gson from 2.2.2 to 2.8.9

Bumps [gson](https://github.com/google/gson) from 2.2.2 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-2.2.2...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

@@ -25,7 +25,7 @@
 		<!-- optional dependencies -->
 		<simplejmx-version>1.17</simplejmx-version>
 		<aws-version>1.10.40</aws-version>
-		<gson-version>2.2.2</gson-version>
+		<gson-version>2.8.9</gson-version>
 		<!-- test dependencies -->
 		<junit-version>4.13.2</junit-version>
 		<easymock-version>3.4</easymock-version>