chore: Upgrade to latest license-checker (#244)

Author: mshabarov

vaadin-portlet/pom.xml

@@ -31,7 +31,7 @@
         <dependency>
             <groupId>com.vaadin</groupId>
             <artifactId>license-checker</artifactId>
-            <version>1.9.0</version>
+            <version>1.12.2</version>
             <scope>compile</scope>
         </dependency>