build(deps): bump versions of google-adk and a2a-sdk (#816)

Not exactly sure what the process is here - so feel free to let me know
if I've missed anything. Mostly interested in the `a2a-sdk` update, as
[`v0.3.1`](https://github.com/a2aproject/a2a-python/releases/tag/v0.3.1)
contains [a fix](a2aproject/a2a-python#383) I
put through to resolve context cancellation issues that have been
plaguing me when testing multi-agent workflows. I did scan the release
notes of both projects for breaking changes, and I don't think any of
them affected this project's usage of the libraries. Ran the default set
of agents locally, and everything seems to work fine.

Signed-off-by: Brian Fox <878612+onematchfox@users.noreply.github.com>

Author: onematchfox

python/packages/kagent-adk/pyproject.toml

@@ -25,14 +25,14 @@ dependencies = [
   "anthropic[vertex]>=0.49.0",
   "fastapi>=0.115.1",
   "litellm>=1.74.3",
-  "google-adk>=1.8.0",
+  "google-adk>=1.11.0",
   "google-genai>=1.21.1",
   "google-auth>=2.40.2",
   "httpx>=0.25.0",
   "pydantic>=2.5.0",
   "typing-extensions>=4.8.0",
   "jsonref>=1.1.0",
-  "a2a-sdk>=0.2.16",
+  "a2a-sdk>=0.3.1",
 ]
 
 [project.scripts]