Update dependency org.apache.rat:apache-rat-plugin to v0.18

Author: renovate[bot]

project/pom.xml

@@ -699,7 +699,7 @@
         <plugin>
           <groupId>org.apache.rat</groupId>
           <artifactId>apache-rat-plugin</artifactId>
-          <version>0.17</version>
+          <version>0.18</version>
           <configuration>
             <inputExcludes>
               <!-- expectation files for unit tests -->