Bump org.jenkins-ci.plugins:badge from 1.9.1 to 2.1

Bumps [org.jenkins-ci.plugins:badge](https://github.com/jenkinsci/badge-plugin) from 1.9.1 to 2.1.
- [Release notes](https://github.com/jenkinsci/badge-plugin/releases)
- [Changelog](https://github.com/jenkinsci/badge-plugin/blob/master/CHANGELOG.adoc)
- [Commits](jenkinsci/badge-plugin@badge-1.9.1...badge-2.1)

---
updated-dependencies:
- dependency-name: org.jenkins-ci.plugins:badge
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

build-monitor-plugin/pom.xml

@@ -71,7 +71,7 @@
     <dependency>
       <groupId>org.jenkins-ci.plugins</groupId>
       <artifactId>badge</artifactId>
-      <version>1.9.1</version>
+      <version>2.1</version>
       <optional>true</optional>
     </dependency>
     <dependency>