chore(deps): update dependency msgpack to v1.2.1

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This MR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
msgpack (changelog)	==1.1.2 → ==1.2.1

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Release Notes

msgpack/msgpack-python (msgpack)

v1.2.1

Compare Source

Release Date: 2026-06-19

Fix a segfault when calling Unpacker.unpack() or Unpacker.skip() after an unpacking failure.
But note that reusing the same Unpacker instance after an unpacking failure is not supported.
Please create a new Unpacker instance instead. GHSA-6v7p-g79w-8964

v1.2.0

Compare Source

Release Date: 2026-06-11

• Support free threaded Python. #​654, #​686
• Dropped support for Python 3.9. #​656
• Fix missing error checks in C code. #​665, #​666, #​667, #​672
• Fix strict_map_key option didn't work for object_pairs_hook. #​673
• Increase DEFAULT_RECURSE_LIMIT of Unpacker to 1024. #​676
• Fix memory leak when Unpacker returns error for invalid input. #​671
• Fix Packer.pack_ext_type() ignored autoreset option. #​663
• Fix Timestamp.from_datetime() returning wrong value for pre-epoch datetimes. #​662
• Fix use-after-free in unpackb() and Unpacker.unpack() for non-contiguous input. #​677
• Fix possible memory leak when calling Unpacker.__init__() several times. #​687

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