Bump org.codehaus.plexus:plexus-testing from 1.1.0 to 1.2.0 (#317)

* Bump org.codehaus.plexus:plexus-testing from 1.1.0 to 1.2.0

Bumps [org.codehaus.plexus:plexus-testing](https://github.com/codehaus-plexus/plexus-testing) from 1.1.0 to 1.2.0.
- [Release notes](https://github.com/codehaus-plexus/plexus-testing/releases)
- [Commits](codehaus-plexus/plexus-testing@plexus-testing-1.1.0...plexus-testing-1.2.0)

---
updated-dependencies:
- dependency-name: org.codehaus.plexus:plexus-testing
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

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

* Manage newer version of Guava required for testing

---------

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

Author: dependabot[bot]

pom.xml

@@ -107,7 +107,12 @@
       <dependency>
         <groupId>org.codehaus.plexus</groupId>
         <artifactId>plexus-testing</artifactId>
-        <version>1.1.0</version>
+        <version>1.2.0</version>
+      </dependency>
+      <dependency>
+        <groupId>com.google.guava</groupId>
+        <artifactId>guava</artifactId>
+        <version>32.1.3-jre</version>
       </dependency>
       <dependency>
         <groupId>org.eclipse.sisu</groupId>