[ALOY-1620] Fix new Buffer deprecation warnings

Description

Node 10 produces a deprecation warning when the new Buffer constructor is used. See https://nodesource.com/blog/understanding-the-buffer-deprecation-in-node-js-10/ if you're curious In most cases I believe the most appropriate swap for us to do is turn new Buffer into Buffer.from There is one instance in the alloy code https://github.com/appcelerator/alloy/search?q=%22new+Buffer%22&unscoped_q=%22new+Buffer%22, it might not show up when alloy is ran however as code under node_modules will not throw the buffer deprecation warning We might also wish to update eslint-config-axway to include the no-buffer-constructor rule Steps to reproduce to be added as replacement happens