fix: import constants from fs, not fs/promises

`constants` was added to fs/promises in Node.js 18.4.  Since we still
support 18.0, it must be imported from fs.

Thanks n/no-unsupported-features/node-builtins for warning about it!

Signed-off-by: Kevin Locke <kevin@kevinlocke.name>

lib/run-node-build.js

@@ -7,9 +7,8 @@
  */
 
 import { spawn } from 'node:child_process';
-import { createWriteStream } from 'node:fs';
+import { constants, createWriteStream } from 'node:fs';
 import {
-  constants,
   copyFile,
   mkdir,
   stat,