Bump version_retrofit from 2.1.0 to 2.9.0

Bumps `version_retrofit` from 2.1.0 to 2.9.0.

Updates `retrofit` from 2.1.0 to 2.9.0
- [Release notes](https://github.com/square/retrofit/releases)
- [Changelog](https://github.com/square/retrofit/blob/master/CHANGELOG.md)
- [Commits](square/retrofit@parent-2.1.0...2.9.0)

Updates `converter-jackson` from 2.1.0 to 2.9.0
- [Release notes](https://github.com/square/retrofit/releases)
- [Changelog](https://github.com/square/retrofit/blob/master/CHANGELOG.md)
- [Commits](square/retrofit@parent-2.1.0...2.9.0)

---
updated-dependencies:
- dependency-name: com.squareup.retrofit2:retrofit
  dependency-type: direct:production
  update-type: version-update:semver-minor
- dependency-name: com.squareup.retrofit2:converter-jackson
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <[email protected]>

build.gradle

@@ -16,7 +16,7 @@ allprojects {
 
             version_log4j = '2.19.0'
             version_jackson = '2.9.0'
-            version_retrofit = '2.1.0'
+            version_retrofit = '2.9.0'
             version_guava = '18.0'
             version_guice = '4.1.0'
             version_tyrus = '1.8.3'