chore(deps): update dependency librt to v0.16.0

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
librt	==0.15.0 → ==0.16.0

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Release Notes

mypyc/librt (librt)

v0.16.0

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[claude]

Looks good, straightforward dependency version bump. Reviewed the change: only a single pinned version bump for librt (0.15.0 to 0.16.0) in requirements-dev.txt, a transitive dev-only dependency pulled in via mypy. No source, test, or build files touched.

Extended reasoning...

The diff is a one-line change bumping the pinned version of librt (a transitive dev dependency of mypy) from 0.15.0 to 0.16.0 in requirements-dev.txt, a pip-compile style lock file. This is a dev-only dependency with no runtime or security-sensitive surface affected, no CODEOWNERS restrictions apply, and the change is mechanical and low-risk, matching the renovate bot's stated purpose.