Bump org.codehaus.plexus:plexus from 17 to 18 (#39)

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

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

pom.xml

@@ -20,7 +20,7 @@ limitations under the License.
   <parent>
     <groupId>org.codehaus.plexus</groupId>
     <artifactId>plexus</artifactId>
-    <version>17</version>
+    <version>18</version>
   </parent>
 
   <artifactId>plexus-xml</artifactId>