chore: bump node to 14

[backflip]

This PR updates the Node version from 12 to 14 as 12 is no longer supported (see https://nodejs.dev/en/about/releases/ for currently supported versions).

An update to Node 16 will require updates to dependencies, so I will do that in a separate step.

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[christophdubach]

At first I was not able to build. I always got the error message Error: Can't find Python executable "python", you can set the PYTHON env variable (macOS 13.3, Apple M1 Pro).

Node 14 seems to require a Python version that was not installed on my machine. I had to go through the following steps, after which it worked:

arch -arm64 brew install pyenv
arch -arm64 pyenv install 2.7.18
pyenv local 2.7.18
export PATH="${HOME}/.pyenv/shims:${PATH}"

[backflip]

@christophdubach, interesting, I will keep an eye on this! I'm planning on updating the whole thing to 18 soon, will be interesting to see whether this persists for you.