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](apache/maven-scm@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
...

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

Author: dependabot[bot]

exist-parent/pom.xml

@@ -952,7 +952,7 @@
                 <plugin>
                     <groupId>org.apache.maven.plugins</groupId>
                     <artifactId>maven-scm-plugin</artifactId>
-                    <version>2.1.0</version>
+                    <version>2.2.1</version>
                     <configuration>
                         <sign>true</sign>
                     </configuration>