chore: bump msgspec from 0.20.0 to 0.21.1

[dependabot]

Bumps msgspec from 0.20.0 to 0.21.1.

Release notes

Sourced from msgspec's releases.

Version 0.21.1

• Fix ValidationError and DecodeError raised in dec_hook being incorrectly wrapped in another ValidationError (#1013).
• Fix a potential NULL dereference in structmeta_get_module_ns (#1016).
• Fix a reference leak in ms_passes_big_int_constraints (#1017).
• Fix missing ref_template parameter in msgspec.json.schema type stub (#1002).
• Clarify order='deterministic' encoder docstrings (#1011).
• Add a porting guide for users migrating from orjson (#1007).

Version 0.21.0

• Fix a segfault on Python 3.13+ that could occur when creating structs that contained a __dict__, instead of only using __slots__ (#960).
• Improve type annotations for msgspec.UNSET (#975).
• Fix hashing of decoded tuples on Python 3.14 (#980).
• Add ref_template arg to msgspec.json.schema (#983).
• Add missing libm linkage to some architectures (#993).
• Fix memory leak when decoding sets (#991).
• Add uniqueItems annotation to set/frozenset JSON schemas (#984).
• BREAKING: Call __post_init__ from msgspec.structs.replace/copy.replace (#1000).

Changelog

Sourced from msgspec's changelog.

Version 0.21.1 (2026-04-13)

• Fix ValidationError and DecodeError raised in dec_hook being incorrectly wrapped in another ValidationError ({pr}1013).
• Fix a potential NULL dereference in structmeta_get_module_ns ({pr}1016).
• Fix a reference leak in ms_passes_big_int_constraints ({pr}1017).
• Fix missing ref_template parameter in msgspec.json.schema type stub ({pr}1002).
• Clarify order='deterministic' encoder docstrings ({pr}1011).
• Add a porting guide for users migrating from orjson ({pr}1007).

Version 0.21.0 (2026-04-08)

• Fix a segfault on Python 3.13+ that could occur when creating structs that contained a __dict__, instead of only using __slots__ ({pr}960).
• Improve type annotations for msgspec.UNSET ({pr}975).
• Fix hashing of decoded tuples on Python 3.14 ({pr}980).
• Add ref_template arg to msgspec.json.schema ({pr}983).
• Add missing libm linkage to some architectures ({pr}993).
• Fix memory leak when decoding sets ({pr}991).
• Add uniqueItems annotation to set/frozenset JSON schemas ({pr}984).
• BREAKING: Call __post_init__ from msgspec.structs.replace/copy.replace ({pr}1000).

Commits

• 10c9ac4 Add changelog for 0.21.1 (#1020)
• 0e29058 Add porting guide for users coming from orjson (#1007)
• 88ce26d fix reference leak in ms_passes_big_int_constraints (#1017)
• bcb7a2b fix NULL check in structmeta_get_module_ns (#1016)
• 42f9184 Fix logo in README for dark and light modes (#969)
• 4ce20fa fix wrapping ValidationError and DecodeError in ValidationError in `dec...
• 20cc59d Clarify wording of order='deterministic' in encoder docstrings (#1011)
• 08edcff Update Pydantic doc links to new site structure (#1008)
• 4024c90 Add ref_tempalte to json.pyi (#1002)
• f99dca7 Update changelog for release 0.21.0 (#1001)
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