Fix release build step broken by the uv migration

[markatto]

setup.py was deleted in #70 but the release workflow still runs uv run --frozen python setup.py sdist, so the next release would fail at the build step. The v2.10.2 release already failed to publish (its workflow run predates #70 and died in the old pipenv setup), which is why PyPI is still at 2.10.1. uv build produces the sdist and wheel from pyproject.toml directly, and gh-action-pypi-publish picks them up from dist/ as before.

Tested by running uv build in this branch: both artifacts build, and the wheel's lightspark_client.py compiles with no SyntaxWarning (the E614_REGEX escape fix from #47 is included, which 2.10.1 on PyPI predates).

[greptile-apps]

Greptile Summary

This PR repairs the release build after the move to pyproject.toml.

• Replaces the deleted setup.py build command with uv build.
• Produces a wheel and source archive in dist/ for the existing PyPI publish step.

Confidence Score: 5/5

This looks safe to merge.

• No blocking issues found in the changed code.
• The build output remains compatible with the existing publish step.

Important Files Changed

Filename	Overview
.github/workflows/release.yaml	Uses the pinned uv installation to create standard distributions in the directory consumed by the PyPI publishing action.

_{Reviews (1): Last reviewed commit: "Fix release build step broken by the uv ..." | Re-trigger Greptile}