deps,test: update postject to 1.0.0-alpha.5

PR-URL: #46934
Fixes: nodejs/postject#76
Reviewed-By: Darshan Sen <raisinten@gmail.com>
Reviewed-By: Antoine du Hamel <duhamelantoine1995@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>

Author: nodejs-github-bot