Bump org.apache.maven.plugin-testing:maven-plugin-testing-harness (#1230)

Bumps org.apache.maven.plugin-testing:maven-plugin-testing-harness from 3.4.0 to 3.5.1.

---
updated-dependencies:
- dependency-name: org.apache.maven.plugin-testing:maven-plugin-testing-harness
  dependency-version: 3.5.1
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

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Author: dependabot[bot]

pom.xml

@@ -492,7 +492,7 @@ under the License.
     <dependency>
       <groupId>org.apache.maven.plugin-testing</groupId>
       <artifactId>maven-plugin-testing-harness</artifactId>
-      <version>3.4.0</version>
+      <version>3.5.1</version>
       <scope>test</scope>
     </dependency>
     <dependency>