Bump postcss and @angular-devkit/build-angular#7

dependabot[bot] wants to merge 1 commit intomainSyncfusionExamples/getting-started-with-the-angular-gantt-chart-component:mainfrom

dependabot/npm_and_yarn/postcss-and-angular-devkit/build-angular-8.4.35SyncfusionExamples/getting-started-with-the-angular-gantt-chart-component:dependabot/npm_and_yarn/postcss-and-angular-devkit/build-angular-8.4.35Copy head branch name to clipboard