crypto: set DEFAULT_ENCODING property to non-enumerable

Since it is a deprecated API, a deprecation warning is printed when
loading crypto module from ESM. Making it non enumerable remove the
deprecation warning and make the API non-available to named imports.

PR-URL: #23222
Fixes: #23203
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Guy Bedford <guybedford@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Sakthipriyan Vairamani <thechargingvolcano@gmail.com>
Reviewed-By: Refael Ackermann <refack@gmail.com>
Reviewed-By: Tobias Nießen <tniessen@tnie.de>

lib/crypto.js

@@ -230,7 +230,7 @@ Object.defineProperties(exports, {
       fipsForced ? setFipsForced : setFipsCrypto
   },
   DEFAULT_ENCODING: {
-    enumerable: true,
+    enumerable: false,
     configurable: true,
     get: deprecate(getDefaultEncoding,
                    'crypto.DEFAULT_ENCODING is deprecated.', 'DEP0091'),