chore(deps): Update a2a-sdk[http-server] requirement

Updates the requirements on [a2a-sdk[http-server]](https://github.com/a2aproject/a2a-python) to permit the latest version.
- [Release notes](https://github.com/a2aproject/a2a-python/releases)
- [Changelog](https://github.com/a2aproject/a2a-python/blob/main/CHANGELOG.md)
- [Commits](a2aproject/a2a-python@v0.2.16...v1.1.0)

---
updated-dependencies:
- dependency-name: a2a-sdk[http-server]
  dependency-version: 1.0.3
  dependency-type: direct:production
...

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

Author: dependabot[bot]

a2a/recipe_agent/pyproject.toml

@@ -8,7 +8,7 @@ authors = [
 license = { text = "Apache" }
 requires-python = ">=3.11"
 dependencies = [
-    "a2a-sdk[http-server]>=0.2.16",
+    "a2a-sdk[http-server]>=1.1.0",
     "openai>=2.38.0",
     "pydantic-settings>=2.14.1",
     "uvicorn>=0.48.0",