test: update postject to 1.0.0-alpha.4

PR-URL: #46212
Reviewed-By: Darshan Sen <raisinten@gmail.com>
Reviewed-By: Robert Nagy <ronagy@icloud.com>
Reviewed-By: Matteo Collina <matteo.collina@gmail.com>
Reviewed-By: Joyee Cheung <joyeec9h3@gmail.com>
Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>
Reviewed-By: Tierney Cyren <hello@bnb.im>

Author: nodejs-github-bot

test/fixtures/postject-copy/node_modules/.bin/postject

@@ -10,6 +10,6 @@
   "author": "",
   "license": "ISC",
   "dependencies": {
-    "postject": "^1.0.0-alpha.3"
+    "postject": "^1.0.0-alpha.4"
   }
 }