deps: update dependency org.assertj:assertj-core to v3 (#1786)

Author: renovate-bot

pom.xml

@@ -128,7 +128,7 @@
         <groupId>org.assertj</groupId>
         <artifactId>assertj-core</artifactId>
         <!-- use 2.9.1 for Java 7 projects -->
-        <version>2.9.1</version>
+        <version>3.22.0</version>
         <scope>test</scope>
       </dependency>
     </dependencies>