minor cleanup in the spring 5 module

spring-5-mvc/pom.xml

@@ -66,7 +66,6 @@
         <dependency>
             <groupId>com.fasterxml.jackson.module</groupId>
             <artifactId>jackson-module-kotlin</artifactId>
-            <version>2.8.7</version>
         </dependency>
 
         <!-- runtime and test scoped -->

spring-5/pom.xml

@@ -114,7 +114,6 @@
             <plugin>
                 <groupId>org.apache.maven.plugins</groupId>
                 <artifactId>maven-surefire-plugin</artifactId>
-                <version>${maven-surefire-plugin.version}</version>
                 <configuration>
                     <forkCount>3</forkCount>
                     <reuseForks>true</reuseForks>
@@ -128,7 +127,6 @@
             <plugin>
                 <groupId>org.apache.maven.plugins</groupId>
                 <artifactId>maven-surefire-plugin</artifactId>
-                <version>${maven-surefire-plugin.version}</version>
                 <configuration>
                     <parallel>methods</parallel>
                     <useUnlimitedThreads>true</useUnlimitedThreads>

spring-5/src/main/java/com/baeldung/functional/MyService.java

@@ -2,8 +2,6 @@ package com.baeldung.functional;
 
 import java.util.Random;
 
-import org.springframework.stereotype.Component;
-
 public class MyService {
 
     public int getRandomNumber(){