chore(deps): bump Python deps in docs/uv.lock for security fixes

Resolve open Dependabot security alerts by upgrading transitive Python
dependencies in docs/uv.lock to their first patched versions or newer:

- urllib3 2.6.3 -> 2.7.0
    GHSA-qccp-gfcp-xxvc (high), GHSA-mf9v-mfxr-j63j (high)
- idna 3.11 -> 3.18
    GHSA-65pc-fj4g-8rjx (medium)
- starlette 0.52.1 -> 1.2.1
    GHSA-86qp-5c8j-p5mr (medium)
- requests 2.32.5 -> 2.34.2
    GHSA-gc5v-m9x4-r6x2 (medium)
- Pygments 2.19.2 -> 2.20.0
    GHSA-5239-wwwm-4pmq (low)

Updated via `uv lock --upgrade-package` (uv 0.10.12, matching the pinned
required-version range) so version and artifact hashes stay consistent;
pyproject.toml is unchanged. Verified with `uv lock --check` and
`uv sync --locked`.

Author: mykaul