Update engines value in package.json

[aravinth-r-7867]

Hi team,
Build failed when sass upgraded to v1.59.0 in our app that uses Node v12. After debugging for a considerable amount of time, we found that dart-sass uses ?? which is supported in Node >=14.0.0. This could be avoided if engines field is properly updated with the NodeJS version that this package supports.

[jathak]

We just published 1.59.3, which removes the ?? operators, so it should now support Node 12 again.

We will still drop support for Node 12 soon, since it's end-of-life, but we'll make sure to do it properly. Sorry for the trouble!