Remove junit-vintage dependency

Co-Authored-By: Julia Krüger <juliakbln@gmail.com>
Co-Authored-By: hulkoba <4191287+hulkoba@users.noreply.github.com>
Co-Authored-By: James Coglan <9265+jcoglan@users.noreply.github.com>
Co-Authored-By: Ninette Adhikari <13760198+ninetteadhikari@users.noreply.github.com>

Author: 5 people

log4j-core-test/pom.xml

@@ -320,13 +320,6 @@
       <scope>test</scope>
     </dependency>
 
-    <!-- JUnit, naturally -->
-    <dependency>
-      <groupId>org.junit.vintage</groupId>
-      <artifactId>junit-vintage-engine</artifactId>
-      <scope>test</scope>
-    </dependency>
-
     <!-- Used for Kafka appender -->
     <dependency>
       <groupId>org.apache.kafka</groupId>