Bump com.github.siom79.japicmp:japicmp-maven-plugin (#403)

Bumps [com.github.siom79.japicmp:japicmp-maven-plugin](https://github.com/siom79/japicmp) from 0.21.0 to 0.21.1.
- [Release notes](https://github.com/siom79/japicmp/releases)
- [Changelog](https://github.com/siom79/japicmp/blob/master/release.py)
- [Commits](siom79/japicmp@japicmp-base-0.21.0...japicmp-base-0.21.1)

---
updated-dependencies:
- dependency-name: com.github.siom79.japicmp:japicmp-maven-plugin
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

pom.xml

@@ -151,7 +151,7 @@
     <commons.failsafe.version>3.2.5</commons.failsafe.version>
     <commons.felix.version>5.1.9</commons.felix.version>
     <commons.jacoco.version>0.8.12</commons.jacoco.version>
-    <commons.japicmp.version>0.21.0</commons.japicmp.version>
+    <commons.japicmp.version>0.21.1</commons.japicmp.version>
     <commons.jar-plugin.version>3.4.1</commons.jar-plugin.version>
     <commons.javadoc.version>3.6.3</commons.javadoc.version>
     <commons.jxr.version>3.3.2</commons.jxr.version>