Update spring-boot-maven-plugin to 2.4.1

Change-Id: I68a6c04a5c7e674410736a45ef0031a2c369a321
Signed-off-by: Matthias Sohn <matthias.sohn@sap.com>

pom.xml

@@ -389,7 +389,7 @@
         <plugin>
           <groupId>org.springframework.boot</groupId>
           <artifactId>spring-boot-maven-plugin</artifactId>
-          <version>2.1.5.RELEASE</version>
+          <version>2.4.1</version>
         </plugin>
       </plugins>
     </pluginManagement>