Bump junit from 4.12 to 4.13.1

Author: dependabot[bot]

pom.xml

@@ -9,7 +9,7 @@
 	<dependency>
     	<groupId>junit</groupId>
     	<artifactId>junit</artifactId>
-    	<version>4.12</version>
+    	<version>4.13.1</version>
 	</dependency>
 	<!-- https://mvnrepository.com/artifact/org.openscience.cdk/cdk-data -->