Bump node-sass client dependency to 7.0.1
Hi.
By trying to install this project yarn returned me an error because I was trying to compile with node v16 but node-sass is in version 4.13.0.
I just changed the required version for node-sass to 7.0.1 and everything worked fine.
node v12 becomes so the minimal required version to install this project (The v8 is already End Of Life and so will be the 12th in march)