misc/codex: Update to 0.66.0

Changelog:

• https://github.com/openai/codex/releases/tag/rust-v0.64.0
• https://github.com/openai/codex/releases/tag/rust-v0.65.0
• https://github.com/openai/codex/releases/tag/rust-v0.66.0

Reported by: GitHub (watch releases)