chore(deps): bump pytest to 9.0.3

[Mason Daugherty (mdrxy)]

CVE-2025-71176 (medium severity)

All are dev-only (test dependency group) — no impact on published packages.

Why syrupy was also bumped

syrupy 4.x (<5.0.0) constrains pytest to <9.0.0, blocking the CVE fix. Widening to <6.0.0 allows syrupy 5.x which supports pytest 9.x.

[codspeed-hq]

Merging this PR will create unknown performance changes

🆕 15 new benchmarks

Performance Changes

	Mode	Benchmark	BASE	HEAD	Efficiency
🆕	WallTime	test_import_time[HumanMessage]	N/A	674 ms	N/A
🆕	WallTime	test_import_time[InMemoryVectorStore]	N/A	1.5 s	N/A
🆕	WallTime	test_import_time[LangChainTracer]	N/A	1.2 s	N/A
🆕	WallTime	test_async_callbacks_in_sync	N/A	56.1 ms	N/A
🆕	WallTime	test_import_time[tool]	N/A	1.4 s	N/A
🆕	WallTime	test_import_time[InMemoryRateLimiter]	N/A	445.6 ms	N/A
🆕	WallTime	test_import_time[CallbackManager]	N/A	815 ms	N/A
🆕	WallTime	test_import_time[RunnableLambda]	N/A	1.3 s	N/A
🆕	WallTime	test_import_time[PydanticOutputParser]	N/A	1.4 s	N/A
🆕	WallTime	test_import_time[ChatPromptTemplate]	N/A	1.6 s	N/A
🆕	WallTime	test_import_time[Document]	N/A	485.4 ms	N/A
🆕	WallTime	test_import_time[BaseChatModel]	N/A	1.4 s	N/A
🆕	WallTime	test_import_time[Runnable]	N/A	1.3 s	N/A
🆕	Simulation	test_create_agent_instantiation	N/A	4.1 ms	N/A
🆕	Simulation	test_create_agent_instantiation_with_middleware	N/A	14.8 ms	N/A

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_{Comparing mdrxy/fix-deps (71069d9) with master (1292c64)¹}

Footnotes

1. No successful run was found on master (cbee5e0) during the generation of this report, so 1292c64 was used instead as the comparison base. There might be some changes unrelated to this pull request in this report. ↩