Update `CHANGELOG.md` and keep it in sync with releases

Question

### What is the type of issue?

Documentation is incorrect

### What is the issue?

The `CHANGELOG.md` in the repo is outdated and not kept in sync with the releases, with the last update being ~3 months ago with version `0.1.2505172129`:

- https://github.com/openai/codex/pull/1008

Yet the latest version is `0.23.0`:

- https://github.com/openai/codex/releases
  - https://github.com/openai/codex/releases/tag/rust-v0.23.0

### Where did you find it?

https://github.com/openai/codex/blob/main/CH