Fix Open Codex update detection and bump version to 0.125.5-leon.

Point npm and bun update checks at the fork's package metadata so update prompts show the correct source, commands, and release notes for Open Codex.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

Author: sa-buc

codex-cli/package.json

@@ -1,6 +1,6 @@
 {
   "name": "@leonw24/open-codex",
-  "version": "0.125.4-leon",
+  "version": "0.125.5-leon",
   "license": "Apache-2.0",
   "bin": {
     "open-codex": "bin/codex.js"