lib: use validator

Used the `validateArray()` validator for array validation
for consistency. (Refs: #39536)

PR-URL: #39547
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Darshan Sen <raisinten@gmail.com>

lib/internal/child_process.js

@@ -366,11 +366,8 @@ ChildProcess.prototype.spawn = function(options) {
     // Let child process know about opened IPC channel
     if (options.envPairs === undefined)
       options.envPairs = [];
-    else if (!ArrayIsArray(options.envPairs)) {
-      throw new ERR_INVALID_ARG_TYPE('options.envPairs',
-                                     'Array',
-                                     options.envPairs);
-    }
+    else
+      validateArray(options.envPairs, 'options.envPairs');
 
     ArrayPrototypePush(options.envPairs, `NODE_CHANNEL_FD=${ipcFd}`);
     ArrayPrototypePush(options.envPairs,