Add missing @deprecated

Author: garydgregory

src/main/java/org/apache/commons/text/translate/EntityArrays.java

@@ -452,6 +452,7 @@ public static Map<CharSequence, CharSequence> invert(final Map<CharSequence, Cha
      *
      * @deprecated Will be private.
      */
+    @Deprecated
     public EntityArrays() {
         // empty
     }