chore(deps): bump httpx2 from 2.9.1 to 2.12.0 in /examples/example-ai-semantic-kernel in the uv group across 1 directory (#934)

chore(deps): bump httpx2

Bumps the uv group with 1 update in the /examples/example-ai-semantic-kernel directory: [httpx2](https://github.com/pydantic/httpx2).


Updates `httpx2` from 2.9.1 to 2.12.0
- [Release notes](https://github.com/pydantic/httpx2/releases)
- [Changelog](https://github.com/pydantic/httpx2/blob/main/src/httpx2/CHANGELOG.md)
- [Commits](pydantic/httpx2@v2.9.1...v2.12.0)

---
updated-dependencies:
- dependency-name: httpx2
  dependency-version: 2.12.0
  dependency-type: indirect
  dependency-group: uv
...

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