Update webpack encore

[nestordedios]

Fixes #2578 .

This PR updates Webpack Encore from v0.31 to v1.5.

The downside of this upgrade is that when running npm run build we get a lot of warning messages in the console like:

: Using / for division is deprecated and will be removed in Dart Sass 2.0.0.

Recommendation: math.div($spacer, 2)

More info and automated migrator: https://sass-lang.com/d/slash-div

   ╷
15 │   padding: $spacer / 2;
   │            ^^^^^^^^^^^
   ╵
    assets/scss/vendor/api-platform.scss 15:12  @import
    assets/scss/vendor/vendor.scss 2:9          @import
    assets/scss/bolt.scss 3:9                   root stylesheet

: Using / for division is deprecated and will be removed in Dart Sass 2.0.0.

Recommendation: math.div($spacer, 2)

More info and automated migrator: https://sass-lang.com/d/slash-div

    ╷
302 │ $headings-margin-bottom:      $spacer / 2 !default;
    │                               ^^^^^^^^^^^
    ╵
    node_modules/bootstrap/scss/_variables.scss 302:31  @import
    assets/scss/themes/_bootstrap.scss 2:9              @import
    assets/scss/themes/dark.scss 39:9                   root stylesheet

: Using / for division is deprecated and will be removed in Dart Sass 2.0.0.

Recommendation: math.div($spacer, 2)

More info and automated migrator: https://sass-lang.com/d/slash-div

[bobdenotter]

Thanks, @nestordedios 👍

The downside of this upgrade is that when running npm run build we get a lot of warning messages in the console like:

We were getting these already! They need to be fixed, but that can/should be done in a separate PR!

[nestordedios]

You are welcome @bobdenotter .

I wasn't aware of that.

I think it's Bootstrap the one making so much noise.

In the Bootstrap repository they seem to have this issue and they suggest to downgrade sass to v1.32.* twbs/bootstrap#34051 (comment) but I don't think this is what we really want.

It seems it is fixed for Bootstrap v5 but not for v4. Maybe it will get fix for Bootstrap v4 as well twbs/bootstrap#34245 (comment). Let's keep an eye on it.

[bobdenotter]

Or, alternatively, see if we can update to Bootstrap 5.1 soon-ish. 👍 (but, both can come in follow-up PR's)

[bobdenotter]

🚀

[nestordedios]

Nice!!

Yes I'll look into Bootstrap migration and open a separate PR for that.