Remove enforcer plug-in from parent as module POMs all have their own

And the parent POM is only there as a convenience to build all the
modules. The modules don't inherit from it.

pom.xml

diff --git a/pom.xml b/pom.xml
index 6e4adb4..3e7e2a8 100644
--- a/pom.xml
+++ b/pom.xml
@@ -27,6 +27,11 @@
         <version>1.0.9</version>
     </parent>
 
+    <!--
+        This POM is only used as a convenient way to build each of the modules.
+        The individual modules do not inherit from this POM.
+    -->
+
     <groupId>jakarta.el</groupId>
     <artifactId>el-parent</artifactId>
     <version>6.1.0-SNAPSHOT</version>
@@ -42,29 +47,4 @@
         <module>tck</module>
     </modules>
 
-    <build>
-        <plugins>
-            <!-- Sets minimal Maven version -->
-            <plugin>
-                <groupId>org.apache.maven.plugins</groupId>
-                <artifactId>maven-enforcer-plugin</artifactId>
-                <version>3.6.2</version>
-                <executions>
-                    <execution>
-                        <id>enforce-maven</id>
-                        <goals>
-                            <goal>enforce</goal>
-                        </goals>
-                        <configuration>
-                            <rules>
-                                <requireMavenVersion>
-                                    <version>3.6.2</version>
-                                </requireMavenVersion>
-                            </rules>
-                        </configuration>
-                    </execution>
-                </executions>
-            </plugin>
-        </plugins>
-    </build>
 </project>