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](google/gson@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>

build.gradle

@@ -33,7 +33,7 @@ dependencies {
     implementation("org.apache.poi:poi-ooxml:$apachePOIVersion")
     implementation("org.apache.poi:poi-ooxml-lite:$apachePOIVersion")
 
-    implementation("com.google.code.gson:gson:2.8.8")
+    implementation("com.google.code.gson:gson:2.8.9")
     implementation("org.apache.tika:tika-core:2.1.0")
 
     implementation group: 'org.apache.logging.log4j', name: 'log4j-api', version: '2.14.1'