Upgrade packages that Dependabot has open PRs about (#415)

* Upgrade json5

* Upgrade express

* Upgrade decode-uri-component

* Upgrade engine.io

* Upgrade loader-utils

* Upgrade socket.io-parser

* Upgrade grunt

* Upgrade karma

* Upgrade browserslist

* Upgrade handlebars

* Upgrade ssri

* Upgrade y18n

* Upgrade elliptic