chore: bump electronjs/node in .circleci/config.yml to 2.1.0

Co-authored-by: electron-roller[bot] <84116207+electron-roller[bot]@users.noreply.github.com>

* fix: handle webpack configs exported as default

* spec: add test

…3433)

* fix: ensure that webpack is run once per arch for universal builds

On universal webpack builds we capture native_modules from node_modules
and store them in .webpack, these means the packager level rebuild hook
doesn't rebuild anything.  We need to rebuild once-per-arch which means
we also need to webpack once-per-arch.

Currently this is fairly naive and missing some things but is safe to land
in it's current form and we can improve on it later.
* We build webpack runs sequentially, this is because they share a node_modules
  folder, we could probably instead run webpack once and map native_modules to
  their resolved webpack locations and rebuild N times but only run webpack once
* We hardcode the universal -> arm64/x64 mapping, this can probably be extended to
  resolving all packager matrixes

* build: fix webpack test tsc

* feat: add support for sequential groups of webpack builds

* fix: use webpack multi-compiler dependency specifications to use a single dev server