fix: handle bare dict in construct_type

[nightcityblade]

• I understand that this repository is auto-generated and my pull request may not be merged

Changes being requested

Fixes #3341.

Treat bare dict annotations as untyped mappings in construct_type() instead of unpacking missing type arguments, and add a focused regression test for construct_type(value={...}, type_=dict).

Additional context & links

Validation:

• uv run pytest tests/test_models.py -k bare_dict
• uv run ruff check src/openai/_models.py tests/test_models.py

[marcuswood-oai]

Thank you for the contribution. The missing type arguments for bare dict annotations are now handled in model construction by #3760, which is merged into main.

Closing this PR because the merged change resolves the same crash. Please use a release containing #3760 when available; the fix is not included in v3.11.0.