Bump gson from 2.8.8 to 2.8.9

Bumps [gson](https://github.com/google/gson) from 2.8.8 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-2.8.8...gson-parent-2.8.9)

---
updated-dependencies:
- dependency-name: com.google.code.gson:gson
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <support@github.com>
diff --git a/pom.xml b/pom.xml
index d60ab78..5de8651 100644
--- a/pom.xml
+++ b/pom.xml
@@ -506,7 +506,7 @@
         <geronimo.spec.annotation.version>1.1.1</geronimo.spec.annotation.version>
         <geronimo.spec.metadata.version>1.1.3</geronimo.spec.metadata.version>
         <geronimo.spec.jaxws.version>1.2</geronimo.spec.jaxws.version>
-        <google.gson.version>2.8.8</google.gson.version>
+        <google.gson.version>2.8.9</google.gson.version>
         <groovy.version>3.0.9</groovy.version>
         <httpcore.version>4.4.14</httpcore.version>
         <httpclient.version>4.5.13</httpclient.version>