Bump gson from 2.3.1 to 2.8.9 in /scripts/gerbil_middleware (informag…

…i#97)

Bumps [gson](https://github.com/google/gson) from 2.3.1 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-2.3.1...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>

scripts/gerbil_middleware/pom.xml

@@ -101,7 +101,7 @@
 		<dependency>
     			<groupId>com.google.code.gson</groupId>
     			<artifactId>gson</artifactId>
-    			<version>2.3.1</version>
+    			<version>2.8.9</version>
 		</dependency>
 
 	</dependencies>