Bump org.eclipse.sisu:org.eclipse.sisu.plexus from 0.9.0.M3 to 0.9.0.M4 (#376)

Bumps [org.eclipse.sisu:org.eclipse.sisu.plexus](https://github.com/eclipse-sisu/sisu-project) from 0.9.0.M3 to 0.9.0.M4.
- [Release notes](https://github.com/eclipse-sisu/sisu-project/releases)
- [Changelog](https://github.com/eclipse-sisu/sisu-project/blob/main/RELEASE.md)
- [Commits](eclipse-sisu/sisu-project@milestones/0.9.0.M3...milestones/0.9.0.M4)

---
updated-dependencies:
- dependency-name: org.eclipse.sisu:org.eclipse.sisu.plexus
  dependency-version: 0.9.0.M4
  dependency-type: direct:development
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

pom.xml

@@ -235,7 +235,7 @@ under the License.
     <dependency>
       <groupId>org.eclipse.sisu</groupId>
       <artifactId>org.eclipse.sisu.plexus</artifactId>
-      <version>0.9.0.M3</version>
+      <version>0.9.0.M4</version>
       <scope>test</scope>
     </dependency>