Update babel-loader dev dep

[rbarilani]

Update babel-loader dev dep when this bug is fixed

[dami-gg]

The bug is still not fixed at the time of planning milestone 2.3.0 so we need to keep waiting

[dami-gg]

There's a comment in the official thread suggesting to downgrade babel-loader to 7.1.1

You can try it as part of milestone 2.4.0 if you want @rbarilani