misc/codex: Update to 0.104.0

Changelog:

• https://github.com/openai/codex/releases/tag/rust-v0.102.0
• https://github.com/openai/codex/releases/tag/rust-v0.103.0
• https://github.com/openai/codex/releases/tag/rust-v0.104.0

Reported by: GitHub (watch releases)