Bump gulp-imagemin from 3.4.0 to 6.1.1#12

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mastermowatermelon/learning-angular-webapp:masterfrom

dependabot/npm_and_yarn/gulp-imagemin-6.1.1mowatermelon/learning-angular-webapp:dependabot/npm_and_yarn/gulp-imagemin-6.1.1Copy head branch name to clipboard