Use dependency groups for dev requirements

[farmio]

and add voluptuous for type checking

[Copilot]

Pull request overview

This PR migrates development dependencies from a standalone requirements_test.txt file to PEP 735 dependency groups in pyproject.toml. It also adds voluptuous as a project dependency and includes it in the dev dependency group for type checking support.

Key Changes:

• Replaced requirements_test.txt with a [dependency-groups] section in pyproject.toml
• Updated dependency versions (pytest 8.4.2→9.0.2, ruff 0.14.9→0.14.10, mypy 1.19.0→1.19.1)
• Modified CI workflow to use the new dependency installation method

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 2 comments.

File	Description
requirements_test.txt	Removed file containing test dependencies
pyproject.toml	Added dependency-groups section with dev dependencies including pytest, ruff, mypy, and voluptuous
.github/workflows/ci.yml	Updated dependency installation command and removed Ruff version-file specification

---

💡 Add Copilot custom instructions for smarter, more guided reviews. Learn how to get started.