Update RAT plugin version from 0.12 to 0.18

Author: DaanHoogland

.github/workflows/rat.yml

@@ -42,7 +42,7 @@ jobs:
         run: |
           git clone https://github.com/shapeblue/cloudstack-nonoss.git nonoss && cd nonoss && bash -x install-non-oss.sh && cd ..
           rm -fr nonoss
-          mvn -P developer,systemvm -Dsimulator -Dnoredist -pl . org.apache.rat:apache-rat-plugin:0.12:check
+          mvn -P developer,systemvm -Dsimulator -Dnoredist -pl . org.apache.rat:apache-rat-plugin:0.18:check
       - name: Rat Report
         if: always()
         run: |