chore(deps): Update a2a-sdk requirement

Updates the requirements on [a2a-sdk](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@v0.3.20...v1.0.2)

---
updated-dependencies:
- dependency-name: a2a-sdk
  dependency-version: 1.0.2
  dependency-type: direct:production
...

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

Author: dependabot[bot]

pyproject.toml

@@ -29,7 +29,7 @@ authors = [
     { name = "Shivdeep Singh", email = "shivdeepsachdeva@gmail.com" },
 ]
 dependencies = [
-    "a2a-sdk[http-server]>=0.3.20,<1.0",
+    "a2a-sdk[http-server]>=0.3.20,<2.0",
     "base58>=2.1.0",
     "pydantic>=2.0,<3.0",
     "pydantic-settings>=2.0,<3.0",