Bump pygments from 2.19.2 to 2.20.0 #1059

Job	Run time
find-tutorials	4s
test-00_sync/000_hello_acp	2m 7s
test-00_sync/010_multiturn	2m 55s
test-10_async/00_base/040_other_sdks	8m 6s
test-00_sync/020_streaming	3m 15s
test-10_async/10_temporal/050_agent_chat_guardrails	1m 56s
test-10_async/10_temporal/090_claude_agents_sdk_mvp	1m 56s
test-10_async/10_temporal/070_open_ai_agents_sdk_tools	2m 26s
test-10_async/00_base/000_hello_acp	2m 11s
test-10_async/10_temporal/060_open_ai_agents_sdk_hello_world	2m 25s
test-10_async/00_base/010_multiturn	2m 52s
test-10_async/10_temporal/030_custom_activities	1m 54s
test-00_sync/030_langgraph	3m 19s
test-10_async/00_base/020_streaming	2m 47s
test-10_async/10_temporal/020_state_machine	7m 59s
test-10_async/10_temporal/000_hello_acp	2m 2s
test-10_async/00_base/030_tracing	1m 56s
test-10_async/00_base/080_batch_events	2m 57s
test-10_async/10_temporal/080_open_ai_agents_sdk_human_in_the_loop	2m 16s
test-10_async/00_base/100_langgraph	2m 13s
test-10_async/10_temporal/010_agent_chat	7m 53s
Test Summary	7s
	1h 5m 36s

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