fix(fetch): refresh uv lockfile for CI

[Chelebii]

Summary

• refresh src/fetch/uv.lock so uv sync --locked --all-extras --dev matches the current project metadata
• keep the scope limited to the Python fetch package

Verification

• uv sync --locked --all-extras --dev in src/fetch
• uv sync --locked --all-extras --dev in src/git
• uv sync --locked --all-extras --dev in src/time

This is split out from #3434 to keep the filesystem fix focused.

[olaservo]

LGTM — single-line lockfile refresh, all CI checks green. Fixes #3548.