4.28.0

What's Changed

• [pre-commit.ci] pre-commit autoupdate by @pre-commit-ci[bot] in #3548
• [docs] Document how to require a plugin by @stephenfin in #3552
• [pre-commit.ci] pre-commit autoupdate by @pre-commit-ci[bot] in #3554
• [pre-commit.ci] pre-commit autoupdate by @pre-commit-ci[bot] in #3558
• Add [testenv] constraints option by @stephenfin in #3556
• [pre-commit.ci] pre-commit autoupdate by @pre-commit-ci[bot] in #3562
• Allow disabling plugins on a one-off by @gaborbernat in #3560

Full Changelog: 4.27.0...4.28.0