Bump org.apache.commons:commons-exec from 1.3 to 1.4.0 (#255)

Bumps org.apache.commons:commons-exec from 1.3 to 1.4.0.

---
updated-dependencies:
- dependency-name: org.apache.commons:commons-exec
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

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pom.xml

@@ -483,7 +483,7 @@
     <dependency>
       <groupId>org.apache.commons</groupId>
       <artifactId>commons-exec</artifactId>
-      <version>1.3</version>
+      <version>1.4.0</version>
       <scope>test</scope>
     </dependency>
     <!-- START very old jars for Justice verifier -->