Bump handlebars from 4.0.11 to 4.7.7 in /ServerSideEditing/ClientApp#18

dependabot[bot] wants to merge 2 commits intomasterSyncfusionExamples/How-to-handle-server-side-data-editing-in-Angular-Tree-Grid:masterfrom

dependabot/npm_and_yarn/ServerSideEditing/ClientApp/handlebars-4.7.7SyncfusionExamples/How-to-handle-server-side-data-editing-in-Angular-Tree-Grid:dependabot/npm_and_yarn/ServerSideEditing/ClientApp/handlebars-4.7.7Copy head branch name to clipboard