v4.61.0

What's Changed

• docs: fix dead virtualenv discovery link in explanation.rst by @CAOShurong in #4042
• Replace deprecated load_module in docs conf by @gaborbernat in #4043
• ✨ feat(toml): allow labeling a range factor group by @gaborbernat in #4049
• 🐛 fix(config): substitute inside override values by @gaborbernat in #4048
• ✨ feat(toml): declare factor group defaults and per-run overrides by @gaborbernat in #4050

Full Changelog: 4.60.1...4.61.0