misc/codex: Update to 0.73.0

Changelog:

• https://github.com/openai/codex/releases/tag/rust-v0.69.0
• https://github.com/openai/codex/releases/tag/rust-v0.71.0
• https://github.com/openai/codex/releases/tag/rust-v0.72.0
• https://github.com/openai/codex/releases/tag/rust-v0.73.0

Reported by: GitHub (watch releases)