Bump filelock from 3.19.1 to 3.20.3 #868

Job	Run time
find-tutorials	4s
test-10_async/00_base/020_streaming	3m 5s
test-10_async/00_base/000_hello_acp	2m 14s
test-00_sync/020_streaming	3m 3s
test-10_async/10_temporal/090_claude_agents_sdk_mvp	2m 14s
test-10_async/10_temporal/010_agent_chat	8m 39s
test-00_sync/010_multiturn	3m 20s
test-10_async/10_temporal/020_state_machine	8m 7s
test-10_async/00_base/030_tracing	2m 14s
test-00_sync/000_hello_acp	2m 24s
test-10_async/10_temporal/080_open_ai_agents_sdk_human_in_the_loop	2m 45s
test-10_async/00_base/010_multiturn	2m 52s
test-10_async/10_temporal/050_agent_chat_guardrails	2m 13s
test-10_async/10_temporal/060_open_ai_agents_sdk_hello_world	2m 34s
test-10_async/00_base/040_other_sdks	8m 30s
test-10_async/10_temporal/070_open_ai_agents_sdk_tools	2m 43s
test-10_async/10_temporal/000_hello_acp	2m 12s
test-10_async/10_temporal/030_custom_activities	2m 17s
test-10_async/00_base/080_batch_events	3m 0s
Test Summary	7s
	1h 4m 37s

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