chore(deps): bump dev tooling for security advisories (#178)

Updates certifi, uv, virtualenv (via tox/tox-uv) and datamodel-code-generator to versions patched for GHSA-6q48-6c7w-9gw2, GHSA-hq85-5cpj-mr62, the virtualenv activation-script advisories, and GHSA-77xj-x4rm-935c.

Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>

Author: benbrandt

pyproject.toml

@@ -34,7 +34,7 @@ Documentation = "https://agentclientprotocol.github.io/python-sdk/"
 
 [dependency-groups]
 dev = [
-    "datamodel-code-generator==0.71.0",
+    "datamodel-code-generator==0.81.0",
     "pytest>=7.2.0",
     "pytest-asyncio>=0.21.0",
     "tox-uv>=1.11.3",