py(deps[uv-sources]): drop temporary local-path overrides

why: the [tool.uv.sources] block pinned gp-sphinx, gp-opengraph, and
gp-sitemap to ../gp-sphinx/packages/<pkg> editable paths so the
in-progress seo-packages branch could be exercised end-to-end on a
laptop. CI cannot reach those paths, and keeping the override in
place makes the seo-packages branch's CI behaviour different from
every other branch's. Drop the override so the branch resolves all
its dependencies from PyPI like main does — that is the cleanest
substrate for testing the docs-publish flow on its own merits.

what:
- pyproject.toml: remove the entire [tool.uv.sources] block plus its
  leading comment block (lines 112-118 before this change)
- uv.lock: regenerate against PyPI; gp-opengraph and gp-sitemap leave
  the dep tree (they never published yet) and sphinxext-opengraph
  v0.13.0 returns as it was before the local override

Author: tony

pyproject.toml

@@ -109,14 +109,6 @@ lint = [
 requires = ["hatchling"]
 build-backend = "hatchling.build"
 
-# Temporary local overrides while the SEO packages are still on the
-# `seo-packages` branch of git-pull/gp-sphinx. Drop this table once the
-# branch is merged and a release is tagged on PyPI.
-[tool.uv.sources]
-gp-sphinx = { path = "../gp-sphinx/packages/gp-sphinx", editable = true }
-gp-opengraph = { path = "../gp-sphinx/packages/gp-opengraph", editable = true }
-gp-sitemap = { path = "../gp-sphinx/packages/gp-sitemap", editable = true }
-
 [tool.mypy]
 strict = true
 python_version = "3.10"