chore(deps): update qianfan requirement from 0.3.18 to 0.4.12.3

Updates the requirements on [qianfan](https://github.com/baidubce/bce-qianfan-sdk) to permit the latest version.
- [Release notes](https://github.com/baidubce/bce-qianfan-sdk/releases)
- [Commits](baidubce/bce-qianfan-sdk@py/v0.3.18...py/v0.4.12.3)

---
updated-dependencies:
- dependency-name: qianfan
  dependency-version: 0.4.12.3
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

pyproject.toml

@@ -26,7 +26,7 @@ langchain-mcp-adapters = "0.0.9"
 langchain-huggingface = "0.1.2"
 langchain-ollama = "0.3.2"
 langgraph = "0.3.31"
-qianfan = "0.3.18"
+qianfan = "0.4.12.3"
 zhipuai = "2.1.5.20250415"
 boto3 = "1.37.36"
 tencentcloud-sdk-python = "3.0.1362"