chore(deps): update dependency openai to v2.28.0

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
openai	2.26.0 → 2.28.0

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Release Notes

openai/openai-python (openai)

v2.28.0

Compare Source

Full Changelog: v2.27.0...v2.28.0

Features

• api: custom voices (50dc060)

v2.27.0

Compare Source

Full Changelog: v2.26.0...v2.27.0

Features

• api: api update (60ab24a)
• api: manual updates (b244b09)
• api: manual updates (d806635)
• api: sora api improvements: character api, video extensions/edits, higher resolution exports. (58b70d3)

Bug Fixes

• api: repair merged videos resource (742d8ee)

Chores

• internal: codegen related update (4e6498e)
• internal: codegen related update (93af129)
• match http protocol with ws protocol instead of wss (026f9de)
• use proper capitalization for WebSockets (a2f9b07)

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Configuration

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