build(deps): update zhipuai requirement

Updates the requirements on zhipuai to permit the latest version.

---
updated-dependencies:
- dependency-name: zhipuai
  dependency-version: 2.1.5.20250421
  dependency-type: direct:production
...

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

Author: dependabot[bot]

pyproject.toml

@@ -28,7 +28,7 @@ langchain-huggingface = "0.1.2"
 langchain-ollama = "0.3.2"
 langgraph = "0.3.31"
 qianfan = "0.4.12.3"
-zhipuai = "2.1.5.20250415"
+zhipuai = "2.1.5.20250421"
 boto3 = "1.37.36"
 tencentcloud-sdk-python = "3.0.1362"
 xinference-client = "1.4.1"