Bump junit from 4.8.1 to 4.13.1

Bumps [junit](https://github.com/junit-team/junit4) from 4.8.1 to 4.13.1.
- [Release notes](https://github.com/junit-team/junit4/releases)
- [Changelog](https://github.com/junit-team/junit4/blob/main/doc/ReleaseNotes4.13.1.md)
- [Commits](https://github.com/junit-team/junit4/compare/r4.8.1...r4.13.1)

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

Signed-off-by: dependabot[bot] <support@github.com>
diff --git a/pom.xml b/pom.xml
index e254f8e..c9ccb31 100644
--- a/pom.xml
+++ b/pom.xml
@@ -85,7 +85,7 @@
       <dependency>
         <groupId>junit</groupId>
         <artifactId>junit</artifactId>
-        <version>4.8.1</version>
+        <version>4.13.1</version>
       </dependency>
       <dependency>
           <groupId>org.apache.james</groupId>