[NO-JIRA] Education plugin should not use internal api

plugins/sonar-education-plugin/build.gradle

@@ -4,6 +4,7 @@ configurations {
 
 dependencies {
     compileOnlyApi 'org.sonarsource.api.plugin:sonar-plugin-api'
+    implementation 'commons-io:commons-io'
 
     testImplementation 'junit:junit'
     testImplementation 'org.assertj:assertj-core'
@@ -23,6 +24,9 @@ jar {
                 'Plugin-Name': 'Education'
         )
     }
+    into('META-INF/lib') {
+        from configurations.runtimeClasspath
+    }
 }
 
 artifactoryPublish.skip = false

plugins/sonar-education-plugin/src/main/java/org/sonar/education/EducationRulesDefinition.java

@@ -20,7 +20,7 @@
 package org.sonar.education;
 
 import java.nio.charset.StandardCharsets;
-import org.sonar.api.internal.apachecommons.io.IOUtils;
+import org.apache.commons.io.IOUtils;
 import org.sonar.api.server.rule.RuleDescriptionSection;
 import org.sonar.api.server.rule.RulesDefinition;
 import org.sonar.education.sensors.EducationPrinciplesSensor;