Bump urllib3 from 1.26.20 to 2.6.3 #905

Job	Run time
find-tutorials	4s
test-10_async/00_base/080_batch_events	3m 46s
test-10_async/10_temporal/050_agent_chat_guardrails	2m 54s
test-10_async/00_base/000_hello_acp	2m 45s
test-10_async/10_temporal/090_claude_agents_sdk_mvp	2m 44s
test-10_async/10_temporal/020_state_machine	8m 55s
test-10_async/10_temporal/010_agent_chat	7m 52s
test-00_sync/010_multiturn	3m 53s
test-10_async/00_base/030_tracing	2m 52s
test-00_sync/020_streaming	3m 50s
test-10_async/10_temporal/030_custom_activities	2m 38s
test-10_async/00_base/040_other_sdks	9m 12s
test-00_sync/000_hello_acp	2m 48s
test-10_async/00_base/010_multiturn	3m 32s
test-10_async/10_temporal/000_hello_acp	2m 59s
test-10_async/10_temporal/060_open_ai_agents_sdk_hello_world	3m 11s
test-10_async/00_base/020_streaming	3m 39s
test-10_async/10_temporal/080_open_ai_agents_sdk_human_in_the_loop	3m 14s
test-10_async/10_temporal/070_open_ai_agents_sdk_tools	3m 17s
Test Summary	6s
	1h 14m 11s

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