Bump plexus-container-default from 1.0-alpha-9-stable-1 to 2.1.0

Bumps [plexus-container-default](https://github.com/codehaus-plexus/plexus-containers) from 1.0-alpha-9-stable-1 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

@@ -41,7 +41,7 @@
       <dependency>
         <groupId>org.codehaus.plexus</groupId>
         <artifactId>plexus-container-default</artifactId>
-        <version>1.0-alpha-9-stable-1</version>
+        <version>2.1.0</version>
       </dependency>
       <dependency>
         <groupId>org.codehaus.plexus</groupId>