build(pom.xml): update JUnit to 4.13

Changelog: https://github.com/junit-team/junit4/blob/master/doc/ReleaseNotes4.13.md

Fix #1247

Author: php-coder

pom.xml

@@ -574,7 +574,7 @@
 		<jsoup.version>1.12.1</jsoup.version>
 
 		<!-- Redefine default value from spring-boot-dependencies -->
-		<junit.version>4.12</junit.version>
+		<junit.version>4.13</junit.version>
 
 		<license.plugin.version>3.0</license.plugin.version>