Bump junit from 4.12 to 4.13.1 in /plugins/de.cognicrypt.codegenerator

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](junit-team/junit4@r4.12...r4.13.1)

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

Author: dependabot[bot]

plugins/de.cognicrypt.codegenerator/pom.xml

@@ -35,7 +35,7 @@
           <dependency>
             <groupId>junit</groupId>
             <artifactId>junit</artifactId>
-            <version>4.12</version>
+            <version>4.13.1</version>
           </dependency>
         </dependencies>
       </plugin>
@@ -48,7 +48,7 @@
           <dependency>
             <groupId>junit</groupId>
             <artifactId>junit</artifactId>
-            <version>4.12</version>
+            <version>4.13.1</version>
           </dependency>
         </dependencies>
         <executions>