Bump tornado from 6.5.2 to 6.5.5 #973

Job	Run time
find-tutorials	4s
test-00_sync/030_langgraph	3m 19s
test-00_sync/000_hello_acp	2m 26s
test-00_sync/020_streaming	3m 14s
test-10_async/10_temporal/070_open_ai_agents_sdk_tools	2m 45s
test-10_async/00_base/080_batch_events	3m 22s
test-10_async/10_temporal/000_hello_acp	2m 31s
test-10_async/10_temporal/020_state_machine	9m 4s
test-10_async/10_temporal/050_agent_chat_guardrails	2m 23s
test-10_async/00_base/020_streaming	3m 5s
test-10_async/00_base/010_multiturn	3m 3s
test-10_async/00_base/040_other_sdks	8m 37s
test-10_async/10_temporal/010_agent_chat	8m 20s
test-00_sync/010_multiturn	3m 35s
test-10_async/10_temporal/080_open_ai_agents_sdk_human_in_the_loop	2m 47s
test-10_async/10_temporal/090_claude_agents_sdk_mvp	2m 17s
test-10_async/00_base/100_langgraph	2m 11s
test-10_async/10_temporal/060_open_ai_agents_sdk_hello_world	2m 51s
test-10_async/10_temporal/030_custom_activities	2m 17s
test-10_async/00_base/030_tracing	2m 24s
test-10_async/00_base/000_hello_acp	2m 18s
Test Summary	5s
	1h 12m 58s

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