sec: relax fastapi upper bound + floor-pin tornado (CVE-2025-62727, CVE-2026-31958) #991

Job	Run time
find-tutorials	4s
test-00_sync/030_langgraph	2m 25s
test-00_sync/020_streaming	2m 29s
test-10_async/10_temporal/000_hello_acp	1m 57s
test-10_async/00_base/100_langgraph	1m 54s
test-10_async/10_temporal/020_state_machine	7m 55s
test-10_async/00_base/080_batch_events	2m 59s
test-00_sync/010_multiturn	2m 32s
test-10_async/00_base/030_tracing	2m 10s
test-10_async/00_base/010_multiturn	6m 20s
test-10_async/10_temporal/010_agent_chat	14m 51s
test-10_async/00_base/020_streaming	2m 46s
test-10_async/10_temporal/030_custom_activities	2m 0s
test-00_sync/000_hello_acp	2m 5s
test-10_async/00_base/000_hello_acp	1m 53s
test-10_async/10_temporal/060_open_ai_agents_sdk_hello_world	2m 30s
test-10_async/00_base/040_other_sdks	14m 47s
test-10_async/10_temporal/090_claude_agents_sdk_mvp	1m 40s
test-10_async/10_temporal/080_open_ai_agents_sdk_human_in_the_loop	12m 25s
test-10_async/10_temporal/050_agent_chat_guardrails	1m 57s
test-10_async/10_temporal/070_open_ai_agents_sdk_tools	7m 29s
Test Summary	7s
	1h 35m 15s

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