v1.68.0

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

## What's Changed
### Changes
* Remove redundant `running tools` parent span by @Kludex in #4560
### 🐛 Bug Fixes
* fix(openai): thinking detection for `gpt-5.3-chat-latest` by @dsfaccini in https://github.com/pydantic/pydantic-ai/pull/4567
* fix: AG-UI follow-up messages failing after built-in tool use by @gcheshkov in https://github.com/pydantic/pydantic-ai/pull/4624
### 📦 Dependencies
* fix: remediate open Dependabot security alerts by @dsfaccini in https://github.com/pydantic/pydantic-ai/pull/4520

## New Contributors
* @gcheshkov made their first contribution in https://github.com/pydantic/pydantic-ai/pull/4624

**Full Changelog**: https://github.com/pydantic/pydantic-ai/compare/v1.67.0...v1.68.0

<!-- Release notes generated using configuration in .github/release.yml at v1.68.0 -->

## What's Changed
### 🚀 Features
* Remove redundant `running tools` parent span by @Kludex in https://github.com/pydantic/pydantic-ai/pull/4560
### 🐛 Bug Fixes
* fix(openai): thinking detection for `gpt-5.3-chat-latest` by @dsfaccini in https://github.com/pydantic/pydantic-ai/pull/4567
* fix: AG-UI follow-up messages failing after built-in tool use by @gcheshkov in https://github.com/pydantic/pydantic-ai/pull/4624
### 📦 Dependencies
* fix: remediate open Dependabot security alerts by @dsfaccini in https://github.com/pydantic/pydantic-ai/pull/4520

## New Contributors
* @gcheshkov made their first contribution in https://github.com/pydantic/pydantic-ai/pull/4624

**Full Changelog**: https://github.com/pydantic/pydantic-ai/compare/v1.67.0...v1.68.0