util: delete unused argument 'depth'

In lib/util.js, Line 1056, there is a 'depth' argument that is unused
for 'process.versions[exports.inspect.custom]', so delete it.

PR-URL: #14267
Reviewed-By: Rich Trott <rtrott@gmail.com>
Reviewed-By: Gibson Fahnestock <gibfahn@gmail.com>
Reviewed-By: Tobias Nießen <tniessen@tnie.de>
Reviewed-By: Refael Ackermann <refack@gmail.com>

lib/util.js

@@ -1054,7 +1054,7 @@ exports._exceptionWithHostPort = function(err,
 
 // process.versions needs a custom function as some values are lazy-evaluated.
 process.versions[exports.inspect.custom] =
-  (depth) => exports.format(JSON.parse(JSON.stringify(process.versions)));
+  () => exports.format(JSON.parse(JSON.stringify(process.versions)));
 
 exports.promisify = internalUtil.promisify;