Bump plexus-utils from 3.5.1 to 4.0.0 and add plexus-xml 3.0.0 (#163)

* Bump plexus-utils from 3.5.1 to 4.0.0

Bumps [plexus-utils](https://github.com/codehaus-plexus/plexus-utils) from 3.5.1 to 4.0.0.
- [Release notes](https://github.com/codehaus-plexus/plexus-utils/releases)
- [Commits](codehaus-plexus/plexus-utils@plexus-utils-3.5.1...plexus-utils-4.0.0)

---
updated-dependencies:
- dependency-name: org.codehaus.plexus:plexus-utils
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

* Use plexus-xml 3.0.0

---------

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>

mrm-servlet/pom.xml

@@ -90,6 +90,10 @@
       <groupId>org.codehaus.plexus</groupId>
       <artifactId>plexus-utils</artifactId>
     </dependency>
+    <dependency>
+      <groupId>org.codehaus.plexus</groupId>
+      <artifactId>plexus-xml</artifactId>
+    </dependency>
 
     <!-- testing -->
     <dependency>

pom.xml

@@ -220,7 +220,12 @@
       <dependency>
         <groupId>org.codehaus.plexus</groupId>
         <artifactId>plexus-utils</artifactId>
-        <version>3.5.1</version>
+        <version>4.0.0</version>
+      </dependency>
+      <dependency>
+        <groupId>org.codehaus.plexus</groupId>
+        <artifactId>plexus-xml</artifactId>
+        <version>3.0.0</version>
       </dependency>
       <dependency>
         <groupId>org.apache.maven.shared</groupId>