deps: update dependency org.easymock:easymock to v4 (#582)

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This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
| [org.easymock:easymock](http://easymock.org) ([source](https://togithub.com/easymock/easymock)) | `3.6` -> `4.3` | [![age](https://badges.renovateapi.com/packages/maven/org.easymock:easymock/4.3/age-slim)](https://docs.renovatebot.com/merge-confidence/) | [![adoption](https://badges.renovateapi.com/packages/maven/org.easymock:easymock/4.3/adoption-slim)](https://docs.renovatebot.com/merge-confidence/) | [![passing](https://badges.renovateapi.com/packages/maven/org.easymock:easymock/4.3/compatibility-slim/3.6)](https://docs.renovatebot.com/merge-confidence/) | [![confidence](https://badges.renovateapi.com/packages/maven/org.easymock:easymock/4.3/confidence-slim/3.6)](https://docs.renovatebot.com/merge-confidence/) |

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pom.xml

@@ -135,7 +135,7 @@
     <dependency>
       <groupId>org.easymock</groupId>
       <artifactId>easymock</artifactId>
-      <version>3.6</version>
+      <version>4.3</version>
       <scope>test</scope>
     </dependency>
   </dependencies>