Warning on sass-loader 14

[garak]

With the latest version of webpack-encore (4.5.0) I get this warning:

WARNING Webpack Encore requires version ^13.0.0 of sass-loader. Your version 14.0.0 is too new. The related feature may still work properly. If you have issues, try downgrading the library, or upgrading Encore.

[stof]

See #1251