feat(ci): add prebuilds for Node.js v16

[kyranet]

Please describe the changes this PR makes and why it should be merged:

This PR adds pre-builds for Node.js v16, as the title says.

Semantic versioning classification:

• This PR changes the library's interface (methods or parameters added)
  • This PR includes breaking changes (methods removed or renamed, parameters moved or removed)
• This PR only includes non-code changes, like changes to documentation, README, etc.

[kyranet]

Should I leave this for a few days and re-run actions later, or remove Node.js v16 pre-builds for musl, as there are build errors with it?

cc: @iCrawl

[Mesteery]

For musl, you should install python3 (or python2) instead of python.

[kyranet]

For musl, you should install python3 (or python2) instead of python.

That worked, thanks!