build(deps): update dependency msgspec to v0.19.0

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
msgspec (source)	== 0.18.6 -> ==0.19.0

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Release Notes

jcrist/msgspec (msgspec)

v0.19.0: Version 0.19.0

Compare Source

• Improve JSON encoding performance by up to 40% (#​647).
• Ensure tuple and frozenset default values are treated identically whether specified by value or default_factory (#​653).
• Fix memory leak of match_args in StructConfig object (#​684).
• Fix memory leak in Raw.copy() (#​709).
• Update decode signatures for PEP 688 (#​740).
• Generate __replace__ method on Struct types, for use with copy.replace (#​747).
• Fix incorrect decoding of certain > 64 bit integers (#​751).
• Call __post_init__ when converting from an object to a Struct (#​752).
• BREAKING: Expand buffer when encode_into is passed a buffer smaller than offset (#​753).
• Support Raw objects as inputs to convert (#​754).
• Error nicely when a dataclass type (instead of an instance) is passed to encode (#​755).
• Drop support for Python 3.8 (#​756, #​763).
• Add support for Python 3.13 (#​711).
• Remove deprecated from_builtins (#​761).
• Support encoding any Enum type whose .value is a supported type (#​757).
• Don't fail eagerly when processing generic types with unsupported __parameters__ (#​772).
• Use eval_type_backport to backport type annotations to Python 3.9 (#​773).

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