Bump org.apache.rat:apache-rat-plugin from 0.16.1 to 0.18

Bumps org.apache.rat:apache-rat-plugin from 0.16.1 to 0.18.

---
updated-dependencies:
- dependency-name: org.apache.rat:apache-rat-plugin
  dependency-version: '0.18'
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

pom.xml

@@ -160,7 +160,7 @@
       <plugin>
         <groupId>org.apache.rat</groupId>
         <artifactId>apache-rat-plugin</artifactId>
-        <version>0.16.1</version>
+        <version>0.18</version>
         <executions>
           <execution>
             <phase>test</phase>