Node 16 support

[nschonni]

Node 16 is currently scheduled for April 20 2021 https://github.com/nodejs/Release

• Update AppVeyor
• Update GitHub Actions
• Add module version 93 to https://github.com/sass/node-sass/blob/master/lib/extensions.js#L83
• Release v5.1.0

/cc @xzyfer @saper

[saper]

Test PR: nodejs/node#37678
NODE_MODULE_VERSION: 93

[pedrofurtado]

Nodejs 16 is out! 🎉🎉 Happy to see the related PR merged and released asap 🥇

[laoshaw]

node 16 failed to build sass

[benjamingr]

Hey Nick, is there an ETA for this? This is blocking us from updating to Node.js 16 :)

Would you like help doing the https://github.com/sass/node-sass/blob/master/lib/extensions.js#L83 update or anything similar?

[saper]

Hey Nick, is there an ETA for this? This is blocking us from updating to Node.js 16 :)

It is a volunteer project, so no ETAs or SLAs. Could you do a quick research for this about the compilers used and the C++ standard required to build nodes 10 (likely to drop #3094), 12, 14 and 16? This is for #3091