fix: support OpenTelemetry 1.39+ by relaxing version constraints

Author: brucearctor

pyproject.toml

@@ -56,13 +56,13 @@ dependencies = [
   "httpx>=0.27,<1",                                     # HTTP client library
   "jsonschema>=4.23,<5",                                # Agent Builder config validation
   "mcp>=1.24,<2",                                       # For MCP Toolset
-  "opentelemetry-api>=1.36,<1.39",                      # OpenTelemetry - keep below 1.39.0 due to current agent_engines exporter constraints.
+  "opentelemetry-api>=1.36,<2",                         # OpenTelemetry
   "opentelemetry-exporter-gcp-logging>=1.9.0a0,<2",
   "opentelemetry-exporter-gcp-monitoring>=1.9.0a0,<2",
   "opentelemetry-exporter-gcp-trace>=1.9,<2",
   "opentelemetry-exporter-otlp-proto-http>=1.36",
   "opentelemetry-resourcedetector-gcp>=1.9.0a0,<2",
-  "opentelemetry-sdk>=1.36,<1.39",
+  "opentelemetry-sdk>=1.36,<2",
   "pyarrow>=14",
   "pydantic>=2.12,<3",                                  # For data validation/models
   "python-dateutil>=2.9.0.post0,<3",                    # For Vertext AI Session Service