Fix blocking calls for OpenAI conversation

[rikroe]

Proposed change

Fixes two blocking calls for openai_conversiation:

• httpx loading SSL certs
• explicitly caching request header data (https://github.com/openai/openai-python/blob/main/src/openai/_base_client.py#L635 / https://github.com/openai/openai-python/blob/main/src/openai/_base_client.py#L1977) during async_setup_entry which e.g. reads /etc/os-release on Linux

Unfortunately, I do not know how to write a test for this (if necessary).

Please assign to the 2024.9 beta milestone.

Type of change

• Dependency upgrade
• Bugfix (non-breaking change which fixes an issue)
• New integration (thank you!)
• New feature (which adds functionality to an existing integration)
• Deprecation (breaking change to happen in the future)
• Breaking change (fix/feature causing existing functionality to break)
• Code quality improvements to existing code or addition of tests

Additional information

• This PR fixes or closes issue: fixes Blocking call for openai_conversation in 2024.9.0b0 #124813
• This PR is related to issue:
• Link to documentation pull request:

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[home-assistant]

Hey there @balloob, mind taking a look at this pull request as it has been labeled with an integration (openai_conversation) you are listed as a code owner for? Thanks!

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[balloob]

We should also report these upstream. They have fixed them before.