Bump filelock from 3.19.1 to 3.20.3 #637

Job	Run time
find-tutorials	4s
test-00_sync/020_streaming	3m 10s
test-00_sync/010_multiturn	3m 12s
test-10_async/00_base/010_multiturn	2m 49s
test-10_async/00_base/000_hello_acp	2m 26s
test-00_sync/000_hello_acp	2m 27s
test-10_async/10_temporal/010_agent_chat	10m 58s
test-10_async/00_base/080_batch_events	3m 12s
test-10_async/10_temporal/020_state_machine	7m 57s
test-10_async/10_temporal/000_hello_acp	2m 20s
test-10_async/10_temporal/090_claude_agents_sdk_mvp	2m 23s
test-10_async/10_temporal/060_open_ai_agents_sdk_hello_world	2m 51s
test-10_async/00_base/040_other_sdks	10m 45s
test-10_async/10_temporal/050_agent_chat_guardrails	2m 14s
test-10_async/10_temporal/030_custom_activities	2m 12s
test-10_async/10_temporal/080_open_ai_agents_sdk_human_in_the_loop	2m 41s
test-10_async/00_base/020_streaming	3m 2s
test-10_async/00_base/030_tracing	2m 13s
test-10_async/10_temporal/070_open_ai_agents_sdk_tools	2m 29s
Test Summary	5s
	1h 9m 30s

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