Bump mockserver-junit-jupiter from 5.14.0 to 5.15.0 (#978)

Co-authored-by: Boni Garcia <boni.garcia@uc3m.es>

Author: dependabot[bot]

pom.xml

@@ -22,7 +22,7 @@
         <logback.version>1.4.5</logback.version>
         <junit.version>5.9.2</junit.version>
         <assertj.version>3.24.1</assertj.version>
-        <mockserver.version>5.14.0</mockserver.version>
+        <mockserver.version>5.15.0</mockserver.version>
 
         <!-- plugins -->
         <maven-release-plugin.version>2.5.3</maven-release-plugin.version>