scikit-hep/cabinetry: v0.5.1

This patch release adds the required lower bound to the matplotlib dependency and improves the ordering of nuisance parameters in the ranking visualization. Full list of changes: chore: updating version to 0.5.1 (#375) feat: sort nuisance parameters by decreasing maximum impact in ranking plot (#373) build: raise minimum required matplotlib version to 3.5.0 (#370) ci: run mypy in Python 3.8 mode instead of Python 3.7 mode (#371) Full Changelog: https://github.com/scikit-hep/cabinetry/compare/v0.5.0...v0.5.