Bump junit from 4.12 to 4.13.1 in /core

Bumps [junit](https://github.com/junit-team/junit4) from 4.12 to 4.13.1.
- [Release notes](https://github.com/junit-team/junit4/releases)
- [Changelog](https://github.com/junit-team/junit4/blob/main/doc/ReleaseNotes4.12.md)
- [Commits](https://github.com/junit-team/junit4/compare/r4.12...r4.13.1)
Signed-off-by: Ndependabot[bot] <support@github.com>

core/pom.xml

@@ -54,7 +54,7 @@
         <yaml.version>1.17</yaml.version>
         <xml.bind.version>2.3.0</xml.bind.version>
         <slf4j.version>1.7.21</slf4j.version>
-        <junit.version>4.12</junit.version>
+        <junit.version>4.13.1</junit.version>
         <easymock.version>4.0.2</easymock.version>
     </properties>
     <dependencies>