chore(deps): update msgspec requirement from ~=0.18.6 to ~=0.19.0

[dependabot]

Updates the requirements on msgspec to permit the latest version.

Release notes

Sourced from msgspec's releases.

Version 0.19.0

• 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).

Commits

• dd965dc Update changelog for 0.19.0
• 8c59e8b chore(build): updated Github CI Actions (#785)
• 4418e5e Use eval_type_backport on Python 3.9 if it's installed to resolve `int | None...
• 3c487c1 Fix typo and readability
• 595c33c Don't fail when parsing types with invalid __parameters__
• 148f9a1 remove copyright year in docs (#767)
• e06e9c9 Remove some missed Python 3.8 code
• 76cbca6 Upgrade ruff in pre-commit
• 07e2abd Remove deprecated from_builtins
• f66bbbd MNT: account for CPython 314 changes (#760)
• Additional commits viewable in compare view

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