Bump junit from 4.11 to 4.13.1 in /pentaho-mongodb-plugin

Bumps [junit](https://github.com/junit-team/junit4) from 4.11 to 4.13.1.
- [Release notes](https://github.com/junit-team/junit4/releases)
- [Changelog](https://github.com/junit-team/junit4/blob/main/doc/ReleaseNotes4.11.md)
- [Commits](junit-team/junit4@r4.11...r4.13.1)

---
updated-dependencies:
- dependency-name: junit:junit
  dependency-type: direct:development
...

Signed-off-by: dependabot[bot] <support@github.com>

pentaho-mongodb-plugin/pom.xml

@@ -32,7 +32,7 @@
 
   <properties>
     <mockito.version>1.9.5</mockito.version>
-    <junit.version>4.11</junit.version>
+    <junit.version>4.13.1</junit.version>
     <mongo-driver.version>3.10.2</mongo-driver.version>
   </properties>