Bump junit from 4.11 to 4.13.1

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)

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

Author: dependabot[bot]

pom.xml

@@ -44,7 +44,7 @@
 		<wicket.version>6.15.0</wicket.version>
 		<jetty9.version>9.4.26.v20200117</jetty9.version>
 		<log4j.version>2.17.0</log4j.version>
-		<junit.version>4.11</junit.version>
+		<junit.version>4.13.1</junit.version>
 		<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
 		<!-- allowed values: R7, 1.0, 1.5, 2.0 or none -->
 		<wtp.version>none</wtp.version>