ci: drop Node.js v14

[codebytere]

Unblocks #15.

CircleCI has switched executors from MacOS / Medium Gen2 to MacOS / M1 Medium - Node.js v14 does not release an arm64 version and therefore does not work anymore.

[dsanders11]

Been working through these with @georgexu99, I've been trying to avoid dropping 14 unless we have to, and if we do, excluding just macOS so we still have 2/3 platform CI coverage.

In order of preference this is what I've been trying to do:

• Pin to Node 14.16 - it's 14.17.0 and above where nvm tries to download binaries which don't exist (seems to be intentional behavior) - example here (requires installing Rosetta as well)
• If that doesn't work (some repos require 14.17+ due to certain packages), then exclude macOS and v14 from the matrix - example here

[codebytere]

given its long past EOL - why? Could we not at this point try adding 22?

[dsanders11]

given its long past EOL - why?

The package supports v14, so we should test it in CI to prevent accidentally introducing breaking changes. At the moment Ecosystem WG policy is to minimize the number of breaking changes for any given package, so we've been avoiding dropping support for old Node.js versions unless we have to, or we're doing other breaking changes.

Could we not at this point try adding 22?

We could, but I think that's a separate question.