fix(deps): update dependency openai to v1.68.0 (#925)

This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
| [openai](https://redirect.github.com/openai/openai-python) |
`==1.67.0` -> `==1.68.0` |
[![age](https://developer.mend.io/api/mc/badges/age/pypi/openai/1.68.0?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![adoption](https://developer.mend.io/api/mc/badges/adoption/pypi/openai/1.68.0?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![passing](https://developer.mend.io/api/mc/badges/compatibility/pypi/openai/1.67.0/1.68.0?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![confidence](https://developer.mend.io/api/mc/badges/confidence/pypi/openai/1.67.0/1.68.0?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|

---

### Release Notes

<details>
<summary>openai/openai-python (openai)</summary>

###
[`v1.68.0`](https://redirect.github.com/openai/openai-python/blob/HEAD/CHANGELOG.md#1680-2025-03-20)

[Compare
Source](https://redirect.github.com/openai/openai-python/compare/v1.67.0...v1.68.0)

Full Changelog:
[v1.67.0...v1.68.0](https://redirect.github.com/openai/openai-python/compare/v1.67.0...v1.68.0)

##### Features

- add audio helpers
([423655c](https://redirect.github.com/openai/openai-python/commit/423655ca9077cfd258f1e52f6eb386fc8307fa5f))
- **api:** new models for TTS, STT, + new audio features for Realtime
([#&#8203;2232](https://redirect.github.com/openai/openai-python/issues/2232))
([ab5192d](https://redirect.github.com/openai/openai-python/commit/ab5192d0a7b417ade622ec94dd48f86beb90692c))

</details>

---

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pyproject.toml

@@ -6,7 +6,7 @@ readme = "README.md"
 # renovate: datasource=python-version depName=python
 requires-python = ">=3.12, <3.14"
 dependencies = [
-  "openai==1.67.0",
+  "openai==1.68.0",
   "tiktoken<1.0.0,>=0.5.1",
   "tabulate>=0.9.0,<1.0.0",
   "codeowners<1.0.0,>=0.6.0",