FIX storybook having a incompatible version of webpack with vue-cli

[ndelangen]

Issue: https://stackoverflow.com/a/53630702

What I did

CHANGE the required version of webpack so it's more likely to be compatible with the users installed version.

[codecov]

Codecov Report

Merging #6259 into next will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             next    #6259   +/-   ##
=======================================
  Coverage   38.12%   38.12%           
=======================================
  Files         646      646           
  Lines        9698     9698           
  Branches      366      366           
=======================================
  Hits         3697     3697           
  Misses       5944     5944           
  Partials       57       57

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[backbone87]

lgtm, but why do the apps also require webpack and do not rely on cores webpack constraint?

[ndelangen]

lgtm, but why do the apps also require webpack and do not rely on cores webpack constraint?

Yeah we should probably use the one from core

[backbone87]

@ndelangen does this also go into 5.0.x?