Update dependency openai to v2.15.0

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
openai	==2.8.1 → ==2.15.0

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Release Notes

openai/openai-python (openai)

v2.15.0

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Full Changelog: v2.14.0...v2.15.0

Features

• api: add new Response completed_at prop (f077752)

Chores

• internal: codegen related update (e7daba6)

v2.14.0

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Full Changelog: v2.13.0...v2.14.0

Features

• api: slugs for new audio models; make all model params accept strings (e517792)

Bug Fixes

• use async_to_httpx_files in patch method (a6af9ee)

Chores

• internal: add --fix argument to lint script (93107ef)

v2.13.0

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Full Changelog: v2.13.0...v2.14.0

Features

• api: slugs for new audio models; make all model params accept strings (e517792)

Bug Fixes

• use async_to_httpx_files in patch method (a6af9ee)

Chores

• internal: add --fix argument to lint script (93107ef)

v2.12.0

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Full Changelog: v2.12.0...v2.13.0

Features

• api: gpt-image-1.5 (1c88f03)

Chores

• ci: add CI job to detect breaking changes with the Agents SDK (#​1436) (237c91e)
• internal: add missing files argument to base client (e6d6fd5)

v2.11.0

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Full Changelog: v2.11.0...v2.12.0

Features

• api: api update (a95c4d0)
• api: fix grader input list, add dated slugs for sora-2 (b2c389b)

v2.9.0

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Full Changelog: v2.9.0...v2.10.0

Features

• api: make model required for the responses/compact endpoint (a12936b)

Bug Fixes

• types: allow pyright to infer TypedDict types within SequenceNotStr (8f0d230)

Chores

• add missing docstrings (f20a9a1)
• internal: update docstring (9a993f2)

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