[CI Bugfix] Pin openai<1.100 to unblock CI

[mgoin]

Purpose

It seems the latest openai python package release broke our CI, so let us pin below for now

https://app.readthedocs.org/projects/vllm/builds/29239011/

File "/home/docs/checkouts/readthedocs.org/user_builds/vllm/checkouts/22023/vllm/reasoning/deepseek_r1_reasoning_parser.py", line 9, in <module>
--
  | from vllm.entrypoints.openai.protocol import (ChatCompletionRequest,
  | File "/home/docs/checkouts/readthedocs.org/user_builds/vllm/checkouts/22023/vllm/entrypoints/openai/protocol.py", line 20, in <module>
  | from openai.types.responses import (ResponseFunctionToolCall,
  | ImportError: cannot import name 'ResponseTextConfig' from 'openai.types.responses' (/home/docs/checkouts/readthedocs.org/user_builds/vllm/envs/22023/lib/python3.12/site-packages/openai/types/responses/__init__.py). Did you mean: 'ResponseFormatTextConfig'?

Test Plan

Test Result

(Optional) Documentation Update

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Essential Elements of an Effective PR Description Checklist

• The purpose of the PR, such as "Fix some issue (link existing issues this PR will resolve)".
• The test plan, such as providing test command.
• The test results, such as pasting the results comparison before and after, or e2e results
• (Optional) The necessary documentation update, such as updating supported_models.md and examples for a new model.

[gemini-code-assist]

Code Review

This pull request pins the openai package to versions below 1.100.0 to resolve a CI failure. This is a standard and effective approach for handling breaking changes in dependencies, ensuring the stability of the continuous integration pipeline. The change is straightforward and appropriate as an immediate fix. No issues of high or critical severity were found in this change.

[github-actions]

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[DarkLight1337]

Docs build is still failing