Unnecessary change revert.

core-java-modules/core-java-21/pom.xml

@@ -22,7 +22,9 @@
                     <target>21</target>
                     <!-- Needed due to a bug with JDK 21, described here: https://issues.apache.org/jira/browse/MCOMPILER-546?page=com.atlassian.jira.plugin.system.issuetabpanels%3Acomment-tabpanel&focusedCommentId=17767513 -->
                     <debug>false</debug>
-                    <compilerArgs>--enable-preview</compilerArgs>
+                    <compilerArgs>
+                        <arg>--enable-preview</arg>
+                    </compilerArgs>
                 </configuration>
             </plugin>
             <plugin>
@@ -36,15 +38,6 @@
         </plugins>
     </build>
 
-    <dependencies>
-        <dependency>
-            <groupId>org.mockito</groupId>
-            <artifactId>mockito-core</artifactId>
-            <version>5.7.0</version>
-            <scope>test</scope>
-        </dependency>
-    </dependencies>
-
     <properties>
         <maven.compiler.source.version>21</maven.compiler.source.version>
         <maven.compiler.target.version>21</maven.compiler.target.version>