RegExpJsToJavaConverter: Use (?s:.) over [\s\S] for better performance

Author: duonglaiquang

src/main/java/org/htmlunit/javascript/regexp/RegExpJsToJavaConverter.java

@@ -241,7 +241,7 @@ private void processCharClassStart() {
                 else if (']' == next) {
                     // [^]
                     tape_.move(-3);
-                    tape_.replace(3, "[\\s\\S]");
+                    tape_.replace(3, "(?s:.)");
                 }
                 else {
                     tape_.move(-1);