Bump io.gsonfire:gson-fire in /functionaltest-jenkins-plugin

Bumps [io.gsonfire:gson-fire](https://github.com/julman99/gson-fire) from 1.8.5 to 1.9.0.
- [Release notes](https://github.com/julman99/gson-fire/releases)
- [Commits](https://github.com/julman99/gson-fire/commits/v1.9.0)

---
updated-dependencies:
- dependency-name: io.gsonfire:gson-fire
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

functionaltest-jenkins-plugin/build.gradle

@@ -40,6 +40,6 @@ dependencies {
 
     implementation 'com.squareup.okhttp3:okhttp:4.12.0'
     implementation 'com.google.code.gson:gson:2.10.1'
-    implementation 'io.gsonfire:gson-fire:1.8.5'
+    implementation 'io.gsonfire:gson-fire:1.9.0'
     implementation 'javax.xml.bind:jaxb-api:2.3.1'
 }