Bump gson in /tycho-its/projects/pomDependencyConsider.p2Data.generate

Bumps [gson](https://github.com/google/gson) from 1.6 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@1.6...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>

tycho-its/projects/pomDependencyConsider.p2Data.generate/pom.xml

@@ -21,7 +21,7 @@
 		<dependency>
 			<groupId>com.google.code.gson</groupId>
 			<artifactId>gson</artifactId>
-			<version>1.6</version>
+			<version>2.8.9</version>
 		</dependency>
 		<dependency>
 		    <groupId>org.eclipse.tycho</groupId>