least-invasive-release

Fix Github Actions

This commit fixes Github Actions by:

* Updating Node version from 12 to 14.

* Updating GHA runner images from Ubuntu 18.04 to 20.04.

* Moving from `manylinux_2_24_x86_64` container image to
  `node:14-buster`.

* Updating C++ version used by MacOS compilation to 17.