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](https://github.com/google/gson/compare/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>
diff --git a/pom.xml b/pom.xml
index 28b2359..3b9b122 100644
--- a/pom.xml
+++ b/pom.xml
@@ -50,7 +50,7 @@
         <osgi.compendium.version>5.0.0</osgi.compendium.version>
         <slf4j.version>1.7.7</slf4j.version>
         <netflix.feign.version>8.18.0</netflix.feign.version>
-        <gson.version>2.8.5</gson.version>
+        <gson.version>2.8.9</gson.version>
         <bnd.version.policy>[$(version;==;$(@)),$(version;+;$(@)))</bnd.version.policy>
     </properties>