webpack needs to be updated to 5.x for NodeJS versions 18 or higher

[poVoq]

The bundle exec rake assets:precompile step fails on newer NodeJS versions with the
error:0308010C:digital envelope routines::unsupported.

This seems to be due to an OpenSSL vulnerability, so that would be rather important to fix.

Currently package.json is set to webpack 4.x, however it appears that this requires webpack 5.x to work.

But the webpack api seems to have changed as well meaning simply using webpack 5.x doesn't work either.

[cooperka]

We are in the middle of some major infrastructure upgrades and this is already in progress. Thank you!