Bump junit from 4.10 to 4.13.1 in /runtime

Bumps [junit](https://github.com/junit-team/junit4) from 4.10 to 4.13.1.
- [Release notes](https://github.com/junit-team/junit4/releases)
- [Changelog](https://github.com/junit-team/junit4/blob/main/doc/ReleaseNotes4.10.md)
- [Commits](junit-team/junit4@r4.10...r4.13.1)

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

runtime/pom.xml

@@ -35,7 +35,7 @@
         <version.org.eclipse.ceylon.cmr>1.1.1-SNAPSHOT</version.org.eclipse.ceylon.cmr>
         <version.org.jboss.modules>1.4.4.Final</version.org.jboss.modules>
         <version.org.jboss.shrinkwrap>1.1.0</version.org.jboss.shrinkwrap>
-        <version.junit>4.10</version.junit>
+        <version.junit>4.13.1</version.junit>
         <!-- Maven -->
         <maven.compiler.target>1.7</maven.compiler.target>
         <maven.compiler.source>1.7</maven.compiler.source>