Dependencies: bump minimist, gulp-clean and mocha#9111

ChrisHuie merged 1 commit intomasterprebid/Prebid.js:masterfrom

dependabot/npm_and_yarn/minimist-and-gulp-clean-and-mocha-1.2.6prebid/Prebid.js:dependabot/npm_and_yarn/minimist-and-gulp-clean-and-mocha-1.2.6Copy head branch name to clipboard