chore(deps): update dependency google-adk to v2

Author: renovate-bot

packages/toolbox-adk/requirements.txt

@@ -1,5 +1,5 @@
 -e ../toolbox-core
-google-adk==1.33.0
+google-adk==2.0.0
 google-auth==2.53.0
 google-auth-oauthlib==1.4.0
 typing-extensions==4.15.0