[Chore] Bump version to 2.9 (#1471)

### Description

Bump version to 2.9

### Context

2.9 release

### Testing

- `./gradlew test`

### Documentation

N/A

### Known limitations

N/A

build.gradle.kts

@@ -161,7 +161,7 @@ subprojects {
 
 allprojects {
   group = "org.stellar.anchor-sdk"
-  version = "2.8.4"
+  version = "2.9.0"
 
   tasks.jar {
     manifest {

docs/README.md

@@ -1,6 +1,6 @@
 [![License](https://badgen.net/badge/license/Apache%202/blue?icon=github&label=License)](https://github.com/stellar/java-stellar-anchor-sdk/blob/develop/LICENSE)
 [![GitHub Version](https://badgen.net/github/release/stellar/java-stellar-anchor-sdk?icon=github&label=Latest%20release)](https://github.com/stellar/java-stellar-anchor-sdk/releases)
-[![Docker](https://badgen.net/badge/Latest%20Release/v2.8.4/blue?icon=docker)](https://hub.docker.com/r/stellar/anchor-platform/tags?page=1&name=2.8.4)
+[![Docker](https://badgen.net/badge/Latest%20Release/v2.9.0/blue?icon=docker)](https://hub.docker.com/r/stellar/anchor-platform/tags?page=1&name=2.9.0)
 ![Develop Branch](https://github.com/stellar/java-stellar-anchor-sdk/actions/workflows/on_push_to_develop.yml/badge.svg?branch=develop)
 
 <div style="text-align: center">

service-runner/src/main/resources/version-info.properties

@@ -1 +1 @@
-version=2.8.4
+version=2.9.0