title: ClassNotFoundException on org.springframework.test.context.TestContextAnnotationUtils when upgrading Spring Boot to 2.4.2
body: <p>In my POM I upgraded the version of Spring Boot from 2.3.5.RELEASE to 2.4.2. As a result, <code>mvn clean test</code> now fails with error</p>
  <pre><code>java.lang.NoClassDefFoundError: org/springframework/test/context/TestContextAnnotationUtils
  Caused by: java.lang.ClassNotFoundException: org.springframework.test.context.TestContextAnnotationUtils
  </code></pre>
  <p>on a test that consists simply in</p>
  <pre><code>package ch.ge.ael.enu.mediation;
  
  import org.junit.jupiter.api.Test;
  import org.springframework.boot.test.context.SpringBootTest;
  
  @SpringBootTest
  class MediationApplicationTests {
  
      @Test
      void contextLoads() {
      }
  
  }
  </code></pre>
  <p>Does anyone have a clue?</p>