Upgrade to assertj 3.12.2

Author: kazuki43zoo

pom.xml

@@ -252,7 +252,7 @@
     <dependency>
       <groupId>org.assertj</groupId>
       <artifactId>assertj-core</artifactId>
-      <version>3.11.1</version>
+      <version>3.12.2</version>
       <scope>test</scope>
     </dependency>
     <dependency>