fix(deps): upgrade dependency msgspec to ~=0.21.0

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
msgspec	~=0.20.0 → ~=0.21.0

---

Warning

Some dependencies could not be looked up. Check the Dependency Dashboard for more information.

---

Release Notes

jcrist/msgspec (msgspec)

v0.21.0: Version 0.21.0

Compare Source

• 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).

---

Configuration

📅 Schedule: (UTC)

• Branch creation
  • At any time (no schedule defined)
• Automerge
  • At any time (no schedule defined)

🚦 Automerge: Disabled by config. Please merge this manually once you are satisfied.

♻ Rebasing: Whenever PR is behind base branch, or you tick the rebase/retry checkbox.

🔕 Ignore: Close this PR and you won't be reminded about this update again.

---

• If you want to rebase/retry this PR, check this box

---

This PR was generated by Mend Renovate. View the repository job log.