Bump msgspec from 0.19.0 to 0.20.0

[dependabot]

Bumps msgspec from 0.19.0 to 0.20.0.

Release notes

Sourced from msgspec's releases.

Version 0.20.0

• 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).

Changelog

Sourced from msgspec's changelog.

Version 0.20.0 (2025-11-23)

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

Commits

• a46a2c6 Make GitHub action resilient to release runs (#953)
• a235d0c Prepare GitHub release (#952)
• 27afa70 Fix typos (#951)
• 40b62da [docs] fix two typos in benchmarks & structs section (#802)
• f78a1e7 Add utilities for Struct-like checks (#950)
• cda7e24 Update changelog (#949)
• 233d916 Fix refcount leak to re.Pattern when using Meta(pattern=...) (#899)
• 2eafc17 Standardize format of the downstream user docs (#948)
• eff6a7c Add Meltano to "Used By" in the docs (#914)
• 242ec07 Add django-modern-rest to "Used by" docs section (#913)
• Additional commits viewable in compare view

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