Bump openai to 2.21.0

[Shulyaka]

Proposed change

Bump openai to 2.21.0.
Changelog: openai/openai-python@v2.15.0...v2.21.0
Includes a fix for a memory leak during parsing of structured outputs (openai/openai-python#2860)

Type of change

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[Copilot]

Pull request overview

Updates Home Assistant’s pinned openai Python client dependency to 2.21.0 across manifests and generated requirements/constraints to pick up upstream fixes (including the structured-output parsing memory leak fix referenced in the PR description).

Changes:

• Bump openai from 2.15.0 to 2.21.0 in integration manifests that depend on it.
• Update requirements_all.txt / requirements_test_all.txt to the new pinned version.
• Update homeassistant/package_constraints.txt to constrain openai at 2.21.0.

Reviewed changes

Copilot reviewed 6 out of 6 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
requirements_test_all.txt	Updates the pinned openai test requirement to 2.21.0.
requirements_all.txt	Updates the pinned openai runtime requirement to 2.21.0.
homeassistant/package_constraints.txt	Updates the global constraint for openai to 2.21.0.
homeassistant/components/openai_conversation/manifest.json	Bumps the integration’s openai requirement to 2.21.0.
homeassistant/components/open_router/manifest.json	Bumps the integration’s openai requirement to 2.21.0.
homeassistant/components/cloud/manifest.json	Bumps Cloud’s openai requirement to 2.21.0.