chore(deps-dev): bump workflow-aggregator

Bumps [workflow-aggregator](https://github.com/jenkinsci/workflow-aggregator-plugin) from 2.7 to 590.v6a_d052e5a_a_b_5.
- [Release notes](https://github.com/jenkinsci/workflow-aggregator-plugin/releases)
- [Commits](https://github.com/jenkinsci/workflow-aggregator-plugin/commits)

---
updated-dependencies:
- dependency-name: org.jenkins-ci.plugins.workflow:workflow-aggregator
  dependency-type: direct:development
...

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

Author: dependabot[bot]

pom.xml

@@ -75,7 +75,7 @@
         <dependency>
           <groupId>org.jenkins-ci.plugins.workflow</groupId>
           <artifactId>workflow-aggregator</artifactId>
-          <version>2.7</version>
+          <version>590.v6a_d052e5a_a_b_5</version>
           <scope>test</scope>
         </dependency>