Nightly 2022-02-19

web: Remove tests on Node.js 14

There seems to be no good reason for testing on Node.js other than
the current LTS. Moreover, npm@6 has a wontfix issue when upgrading
to 8.4 on Windows, which requires a complex workaround: https://github.com/npm/cli/issues/4341#issuecomment-1040608101.

So avoid it by simply not supporting it.