Bump gson from 2.8.5 to 2.8.9 in /aws-lambda-java-serialization (#341)

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]>

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: Carl Zogheib <[email protected]>

Author: dependabot[bot]

aws-lambda-java-serialization/pom.xml

@@ -44,7 +44,7 @@
         <dependency>
             <groupId>com.google.code.gson</groupId>
             <artifactId>gson</artifactId>
-            <version>2.8.5</version>
+            <version>2.8.9</version>
         </dependency>
         <dependency>
             <groupId>org.json</groupId>