HADOOP-14692. Upgrade Apache Rat

Signed-off-by: Anu Engineer <aegineer@apache.org>

pom.xml

@@ -102,7 +102,7 @@ xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xs
     <maven-gpg-plugin.version>1.5</maven-gpg-plugin.version>
     <maven-remote-resources-plugin.version>1.5</maven-remote-resources-plugin.version>
     <maven-resources-plugin.version>3.0.1</maven-resources-plugin.version>
-    <apache-rat-plugin.version>0.10</apache-rat-plugin.version>
+    <apache-rat-plugin.version>0.12</apache-rat-plugin.version>
     <wagon-ssh.version>1.0</wagon-ssh.version>
     <maven-clover2-plugin.version>3.3.0</maven-clover2-plugin.version>
     <maven-bundle-plugin.version>2.5.0</maven-bundle-plugin.version>