Bump echarts-api from 4.8.0-2 to 4.9.0-1

Bumps [echarts-api](https://github.com/jenkinsci/echarts-api-plugin) from 4.8.0-2 to 4.9.0-1.
- [Release notes](https://github.com/jenkinsci/echarts-api-plugin/releases)
- [Changelog](https://github.com/jenkinsci/echarts-api-plugin/blob/master/CHANGELOG.md)
- [Commits](jenkinsci/echarts-api-plugin@echarts-api-4.8.0-2...v4.9.0-1)

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

pom.xml

@@ -48,7 +48,7 @@
         <dependency>
             <groupId>io.jenkins.plugins</groupId>
             <artifactId>echarts-api</artifactId>
-            <version>4.8.0-2</version>
+            <version>4.9.0-1</version>
         </dependency>
         <dependency>
             <groupId>io.jenkins.plugins</groupId>