chore(deps): update dependency mypy to v2.3.1

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
mypy (changelog)	==2.3.0 → ==2.3.1

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Release Notes

python/mypy (mypy)

v2.3.1

Compare Source

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[claude]

LGTM — trivial dev-dependency patch bump.

Extended reasoning...

Overview

Single-line change in requirements-dev.txt, bumping the pinned dev dependency mypy from 2.3.0 to 2.3.1 (a patch release). Auto-generated by Renovate via pip-compile; no source code, no application dependencies, and no other lockfile entries are touched.

Security risks

None. mypy is a dev-only type-checking tool that never ships in the runtime package; this change has no effect on the library's supply chain or runtime security surface.

Level of scrutiny

Minimal scrutiny warranted — this is a mechanical, autogenerated lockfile update to a dev tool patch version, the lowest-risk category of change possible.

Other factors

No prior reviews or discussion on this PR. The bug hunting system found no issues, consistent with the trivial nature of the diff.