chore(deps): update dependency openai to v1.40.8

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
openai	==1.40.7 -> ==1.40.8

---

Release Notes

openai/openai-python (openai)

### [`v1.40.8`](https://togithub.com/openai/openai-python/blob/HEAD/CHANGELOG.md#1408-2024-08-15) [Compare Source](https://togithub.com/openai/openai-python/compare/v1.40.7...v1.40.8) Full Changelog: [v1.40.7...v1.40.8](https://togithub.com/openai/openai-python/compare/v1.40.7...v1.40.8) ##### Chores - **types:** define FilePurpose enum ([#​1653](https://togithub.com/openai/openai-python/issues/1653)) ([3c2eeae](https://togithub.com/openai/openai-python/commit/3c2eeae32adf5d4ab6bc622be6f9a95a1a298dd3))

---

Configuration

📅 Schedule: Branch creation - At any time (no schedule defined), Automerge - At any time (no schedule defined).

🚦 Automerge: Enabled.

♻ Rebasing: Whenever PR becomes conflicted, or you tick the rebase/retry checkbox.

🔕 Ignore: Close this PR and you won't be reminded about this update again.

---

• [ ] If you want to rebase/retry this PR, check this box

---

This PR was generated by Mend Renovate. View the repository job log.