chore: update dependency lock file

[github-actions]

Automated weekly refresh of requirements-lock.txt.

Generated by pip-compile --upgrade from the bounded specifiers
in requirements.txt (must match pyproject.toml [project.dependencies]).

Dependabot pip PRs may bump bounds in requirements.txt / pyproject.toml
but do not regenerate this lock file — merge those first, then merge this PR
(or run Actions → Update dependency lock file → Run workflow).

Review the diff to confirm no unexpected major-version jumps before merging.

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