Bump org.apache.maven.plugins:maven-scm-plugin from 2.1.0 to 2.2.1

Bumps [org.apache.maven.plugins:maven-scm-plugin](https://github.com/apache/maven-scm) from 2.1.0 to 2.2.1.
- [Release notes](https://github.com/apache/maven-scm/releases)
- [Commits](https://github.com/apache/maven-scm/compare/maven-scm-2.1.0...v2.2.1)

---
updated-dependencies:
- dependency-name: org.apache.maven.plugins:maven-scm-plugin
  dependency-version: 2.2.1
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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