chore: remove duplicate dev deps from [project.optional-dependencies]

Issue 080 added [dependency-groups] dev (PEP 735) but left the
identical [project.optional-dependencies] dev in place. Remove the
duplicate to eliminate drift risk — dev tools are now installed
solely via `uv sync` using the [dependency-groups] section.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: antoineleclair

pyproject.toml

@@ -28,9 +28,6 @@ Homepage = "https://github.com/letsdiscodev/python-dqlite-wire"
 Repository = "https://github.com/letsdiscodev/python-dqlite-wire"
 Issues = "https://github.com/letsdiscodev/python-dqlite-wire/issues"
 
-[project.optional-dependencies]
-dev = ["pytest>=8.0", "pytest-cov>=4.0", "mypy>=1.0", "ruff>=0.4"]
-
 [dependency-groups]
 dev = ["pytest>=8.0", "pytest-cov>=4.0", "mypy>=1.0", "ruff>=0.4"]