Bump plexus-container-default from 1.0-alpha-30 to 2.1.0

Bumps [plexus-container-default](https://github.com/codehaus-plexus/plexus-containers) from 1.0-alpha-30 to 2.1.0.
- [Release notes](https://github.com/codehaus-plexus/plexus-containers/releases)
- [Changelog](https://github.com/codehaus-plexus/plexus-containers/blob/master/ReleaseNotes.md)
- [Commits](https://github.com/codehaus-plexus/plexus-containers/commits/plexus-containers-2.1.0)

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

pom.xml

@@ -45,7 +45,7 @@
       <groupId>org.codehaus.plexus</groupId>
       <artifactId>plexus-container-default</artifactId>
       <scope>test</scope>
-      <version>1.0-alpha-30</version>
+      <version>2.1.0</version>
     </dependency>
     <dependency>
       <groupId>com.google.code.findbugs</groupId>