Bump clean-css from 5.1.2 to 5.1.5#21

dependabot[bot] wants to merge 1 commit intomainGenderedIntelligence/enquirywitch:mainfrom

dependabot/npm_and_yarn/clean-css-5.1.5GenderedIntelligence/enquirywitch:dependabot/npm_and_yarn/clean-css-5.1.5Copy head branch name to clipboard