Update dependency mcp to v1.21.2

Signed-off-by: konflux-internal-p02 <170854209+konflux-internal-p02[bot]@users.noreply.github.com>

Author: konflux-internal-p02[bot]

demos/continuous_batching/agentic_ai/requirements.txt

@@ -1,5 +1,5 @@
 openai==1.107.0
 openai-agents==0.2.11
-mcp==1.13.1
+mcp==1.21.2
 python-dateutil
 mcp_weather_server==0.1.3