Update report to getRequired instead of deprecated alternative. (#5182)

Author: rlazo

buildSrc/src/main/java/com/google/firebase/gradle/plugins/ci/Coverage.java

@@ -98,7 +98,7 @@ public static void apply(FirebaseLibraryExtension firebaseLibrary) {
                         .getHtml()
                         .setDestination(
                             new File(reportsDir, firebaseLibrary.artifactId.get() + "/html"));
-                    reports.getXml().setEnabled(true);
+                    reports.getXml().getRequired().set(true);
                     reports
                         .getXml()
                         .setDestination(