chore(deps): upgrade dependency msgspec to ~=0.20.0

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
msgspec (source)	~=0.19.0 -> ~=0.20.0

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Release Notes

jcrist/msgspec (msgspec)

v0.20.0: Version 0.20.0

Compare Source

• Support Python 3.14, including freethreaded mode (#​852, #​877).
• Expose the StructMeta metaclass (#​890, #​927, #​928, #​940, #​945).
• Add msgspec.inspect.is_struct and msgspec.inspect.is_struct_type functions for checking whether an object is a msgspec.Struct-like instance or class (#​950).
• Support Windows arm64 builds (#​943).
• Enable ThinLTO on macOS aarch64 builds (#​937).
• Fix leaks of re.Pattern objects when using pattern constraints of msgspec.Meta (#​899).
• Fixed memoryview support for msgspec.msgpack (#​836).
• Fix crash when typing.TypedDict contains incorrect metadata (#​853, #​947).
• Add setuptools-scm as a build dependency instead of vendoring versioneer (#​905).
• Remove support for legacy packaging builds (#​907).
• Improved the developer experience by adding the just command runner and Dev Container support (#​918).

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