chore(deps): Update ag2[mcp,openai,tracing] requirement

Updates the requirements on [ag2[mcp,openai,tracing]](https://github.com/ag2ai/ag2) to permit the latest version.
- [Release notes](https://github.com/ag2ai/ag2/releases)
- [Commits](ag2ai/ag2@v0.13.2...v0.14.0)

---
updated-dependencies:
- dependency-name: ag2[mcp,openai,tracing]
  dependency-version: 0.14.0
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

a2a/simple_generalist/pyproject.toml

@@ -6,7 +6,7 @@ description = "A generalist AG2 agent exposed via A2A, powered by MCP tools"
 dependencies = [
     "python-dotenv>=1.2.2",
     "a2a-sdk[http-server]>=1.1.0,<2",
-    "ag2[openai,mcp,tracing]>=0.13.2",
+    "ag2[openai,mcp,tracing]>=0.14.0",
     "httpx>=0.28.1",
     "pydantic>=2.13.4",
     "pydantic-settings>=2.14.1",