Bump @azure/openai from 1.0.0-beta.11 to 1.0.0-beta.12

Bumps [@azure/openai](https://github.com/Azure/azure-sdk-for-js) from 1.0.0-beta.11 to 1.0.0-beta.12.
- [Release notes](https://github.com/Azure/azure-sdk-for-js/releases)
- [Changelog](https://github.com/Azure/azure-sdk-for-js/blob/main/documentation/Changelog-for-next-generation.md)
- [Commits](https://github.com/Azure/azure-sdk-for-js/compare/@azure/openai_1.0.0-beta.11...@azure/openai_1.0.0-beta.12)

---
updated-dependencies:
- dependency-name: "@azure/openai"
  dependency-type: direct:development
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <[email protected]>