Update dependency fastapi to v0.115.12

This MR contains the following updates:

Package	Type	Update	Change
fastapi (changelog)	dependencies	patch	0.115.11 -> 0.115.12

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Release Notes

fastapi/fastapi (fastapi)

v0.115.12

Compare Source

Fixes

• Fix convert_underscores=False for header Pydantic models. MR #​13515 by @​tiangolo.

Docs

• Update docs/en/docs/tutorial/middleware.md. MR #​13444 by @​Rishat-F.
• Update FastAPI People - Experts. MR #​13493 by @​tiangolo.

Translations

• Add Ukrainian translation for docs/uk/docs/tutorial/metadata.md page. MR #​13459 by @​valentinDruzhinin.
• Add Ukrainian translation for docs/uk/docs/tutorial/response-status-code.md page. MR #​13462 by @​valentinDruzhinin.
• Add Ukrainian translation for docs/uk/docs/tutorial/cookie-param-models.md page. MR #​13460 by @​valentinDruzhinin.
• Add Ukrainian translation for docs/uk/docs/tutorial/header-param-models.md page. MR #​13461 by @​valentinDruzhinin.
• Add Japanese translation for docs/ja/docs/virtual-environments.md. MR #​13304 by @​k94-ishi.
• Add Korean translation for docs/ko/docs/tutorial/security/oauth2-jwt.md. MR #​13333 by @​yes0ng.
• Add Vietnamese translation for docs/vi/docs/deployment/cloud.md. MR #​13407 by @​ptt3199.

Internal

• Bump pydantic-ai from 0.0.15 to 0.0.30. MR #​13438 by @​dependabot[bot].
• Bump sqlmodel from 0.0.22 to 0.0.23. MR #​13437 by @​dependabot[bot].
• Bump black from 24.10.0 to 25.1.0. MR #​13436 by @​dependabot[bot].
• Bump ruff to 0.9.4. MR #​13299 by @​dependabot[bot].
• Update sponsors: pause TestDriven. MR #​13446 by @​tiangolo.

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