v2.34.0

<!-- Release notes generated using configuration in .github/release.yml at main -->

## What's Changed
### 🚀 Features
* Add a LangChain migration skill by @adtyavrdhn in https://github.com/pydantic/pydantic-ai/pull/7679
* Add GLM-5.3 support to `ZaiModel` by @aisk in https://github.com/pydantic/pydantic-ai/pull/7600
### 🐛 Bug Fixes
* Fix `TestModel` generation for equal inclusive bounds by [@pydanty](https://github.com/apps/pydanty) in https://github.com/pydantic/pydantic-ai/pull/7642
* Render enum $refs as `Literal` in `FunctionSignature` by [@pydanty](https://github.com/apps/pydanty) in https://github.com/pydantic/pydantic-ai/pull/7579
* Fix `TestModel` generation of falsy JSON Schema `const` values by [@pydanty](https://github.com/apps/pydanty) in https://github.com/pydantic/pydantic-ai/pull/7630
* Fix stale `UIEventStream` part state on cancellation by @adtyavrdhn in https://github.com/pydantic/pydantic-ai/pull/7675
* Only strip `logit_bias` from Cerebras model settings by @ryanl-cerebras in https://github.com/pydantic/pydantic-ai/pull/7653
* Fix `VercelAIAdapter` rejecting reasoning part `id` in run input by [@pydanty](https://github.com/apps/pydanty) in https://github.com/pydantic/pydantic-ai/pull/7706
* Fix dropped zero-argument tool calls in `CohereModel` by [@pydanty](https://github.com/apps/pydanty) in https://github.com/pydantic/pydantic-ai/pull/7720
* Fix `VercelProvider` dropping the Groq profile for `groq/`-prefixed models by [@pydanty](https://github.com/apps/pydanty) in https://github.com/pydantic/pydantic-ai/pull/7551
* fix(evals): honor zero-valued `SpanQuery` maximums by @lntutor in https://github.com/pydantic/pydantic-ai/pull/6934
* Handle asctime-form `Retry-After` dates in `wait_retry_after()` by @parveshsaini in https://github.com/pydantic/pydantic-ai/pull/7711
* Honor agent tool retry budget for `load_capability` by @lntutor in https://github.com/pydantic/pydantic-ai/pull/6937
* Recognize Bedrock’s `r1` alias in `deepseek_model_profile()` by @adtyavrdhn in https://github.com/pydantic/pydantic-ai/pull/7723

## New Contributors
* @brianosaurus made their first contribution in https://github.com/pydantic/pydantic-ai/pull/7522
* @junqi410-create made their first contribution in https://github.com/pydantic/pydantic-ai/pull/7669
* @aisk made their first contribution in https://github.com/pydantic/pydantic-ai/pull/7600
* @ryanl-cerebras made their first contribution in https://github.com/pydantic/pydantic-ai/pull/7653
* @parveshsaini made their first contribution in https://github.com/pydantic/pydantic-ai/pull/7711

**Full Changelog**: https://github.com/pydantic/pydantic-ai/compare/v2.33.0...v2.34.0