Scope proto-plus>=1.26.1 to ml_adk extra

Author: aIbrahiim

sdks/python/setup.py

@@ -186,6 +186,9 @@ def cythonize(*args, **kwargs):
 
 ml_adk_dependency = [
     'google-adk==1.28.1',
+    # proto-plus<1.24 caps protobuf<5; opentelemetry-proto (via ADK) needs
+    # protobuf>=5. Scoped here so the main dependency list stays broader.
+    'proto-plus>=1.26.1,<2',
     'opentelemetry-api==1.37.0',
     'opentelemetry-sdk==1.37.0',
     'opentelemetry-exporter-otlp-proto-http==1.37.0',
@@ -408,10 +411,10 @@ def get_portability_package_data():
           'packaging>=22.0',
           'pillow>=12.1.1,<13',
           'pymongo>=3.8.0,<5.0.0',
-          # proto-plus<1.24 requires protobuf<5; opentelemetry-proto
-          # (google-adk) needs protobuf>=5. 1.26.1 allows protobuf<7
-          # (matches Beam's cap).
-          'proto-plus>=1.26.1,<2',
+          # ADK / OpenTelemetry need proto-plus>=1.26.1 (protobuf>=5); that
+          # floor is declared on ml_adk_dependency only so core installs stay
+          # compatible with older proto-plus.
+          'proto-plus>=1.7.1,<2',
           # 1. Use a tighter upper bound in protobuf dependency to make sure
           # the minor version at job submission
           # does not exceed the minor version at runtime.