Bump handlebars from 4.0.12 to 4.7.7 in /angular-client#2

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dependabot/npm_and_yarn/angular-client/handlebars-4.7.7jcmdsbr/poc-aspnetcore-angular-signalr-notifications:dependabot/npm_and_yarn/angular-client/handlebars-4.7.7Copy head branch name to clipboard