fix version of adk google-adk==1.19.0

Author: cuericlee

pyproject.toml

@@ -15,7 +15,7 @@ dependencies = [
     "pydantic-settings==2.10.1", # Config management
     "a2a-sdk==0.3.7", # For Google Agent2Agent protocol
     "deprecated==1.2.18",
-    "google-adk>=1.19.0", # For basic agent architecture
+    "google-adk==1.19.0", # For basic agent architecture
     "litellm>=1.74.3,<=1.82.6", # For model inference
     "loguru==0.7.3", # For better logging
     "opentelemetry-exporter-otlp==1.37.0",