mockito 3.1.0 (#4035)

Author: sullis

modules/openapi-generator/pom.xml

@@ -300,7 +300,7 @@
         <dependency>
             <groupId>org.mockito</groupId>
             <artifactId>mockito-core</artifactId>
-            <version>3.0.0</version>
+            <version>3.1.0</version>
             <scope>test</scope>
         </dependency>
         <dependency>