chore: bump orjson from 3.11.5 to 3.11.6 in /libs/core

[dependabot]

Bumps orjson from 3.11.5 to 3.11.6.

Release notes

Sourced from orjson's releases.

3.11.6

Changed

• orjson now includes code licensed under the Mozilla Public License 2.0 (MPL-2.0).
• Drop support for Python 3.9.
• ABI compatibility with CPython 3.15 alpha 5.
• Build now depends on Rust 1.89 or later instead of 1.85.

Fixed

• Fix sporadic crash serializing deeply nested list of dict.

Changelog

Sourced from orjson's changelog.

3.11.6 - 2026-01-29

Changed

• orjson now includes code licensed under the Mozilla Public License 2.0 (MPL-2.0).
• Drop support for Python 3.9.
• ABI compatibility with CPython 3.15 alpha 5.
• Build now depends on Rust 1.89 or later instead of 1.85.

Fixed

• Fix sporadic crash serializing deeply nested list of dict.

Commits

• ec02024 3.11.6
• d581687 build, clippy misc
• 4105b29 writer::num
• 62bb185 Fix sporadic crash on serializing object close
• d860078 PyRef idiom refactors
• 343ae2f Deserializer, Utf8Buffer
• 7835f58 PyBytesRef and other input refactor
• 71e0516 PyStrRef
• 1096df4 MSRV 1.89
• b718e75 Drop support for python3.9
• Additional commits viewable in compare view

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[codspeed-hq]

Merging this PR will improve performance by 34.74%

⚠️ Unknown Walltime execution environment detected

Using the Walltime instrument on standard Hosted Runners will lead to inconsistent data.

For the most accurate results, we recommend using CodSpeed Macro Runners: bare-metal machines fine-tuned for performance measurement consistency.

⚡ 13 improved benchmarks
⏩ 23 skipped benchmarks¹

Performance Changes

	Mode	Benchmark	BASE	HEAD	Efficiency
⚡	WallTime	test_async_callbacks_in_sync	25.8 ms	19.2 ms	+34.74%
⚡	WallTime	test_import_time[PydanticOutputParser]	571.8 ms	485.1 ms	+17.87%
⚡	WallTime	test_import_time[ChatPromptTemplate]	668.1 ms	568.5 ms	+17.52%
⚡	WallTime	test_import_time[BaseChatModel]	556 ms	496.2 ms	+12.04%
⚡	WallTime	test_import_time[Runnable]	521.5 ms	462 ms	+12.87%
⚡	WallTime	test_import_time[Document]	196.2 ms	174.7 ms	+12.29%
⚡	WallTime	test_import_time[HumanMessage]	274.5 ms	244.8 ms	+12.15%
⚡	WallTime	test_import_time[InMemoryRateLimiter]	182.8 ms	161.3 ms	+13.3%
⚡	WallTime	test_import_time[LangChainTracer]	475.3 ms	421.6 ms	+12.75%
⚡	WallTime	test_import_time[tool]	569.9 ms	499.4 ms	+14.12%
⚡	WallTime	test_import_time[CallbackManager]	329.8 ms	299.8 ms	+10.03%
⚡	WallTime	test_import_time[RunnableLambda]	526.3 ms	460.9 ms	+14.2%
⚡	WallTime	test_import_time[InMemoryVectorStore]	639.9 ms	569.2 ms	+12.42%

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_{Comparing dependabot/uv/libs/core/orjson-3.11.6 (541e1be) with master (69a7b9c)²}

Footnotes

1. 23 benchmarks were skipped, so the baseline results were used instead. If they were deleted from the codebase, click here and archive them to remove them from the performance reports. ↩

2. No successful run was found on master (2bad58a) during the generation of this report, so 69a7b9c was used instead as the comparison base. There might be some changes unrelated to this pull request in this report. ↩