Remove coverage from GitHub Actions
Remove coverage from GitHub Actions

Since e31c41433d65bef1c64b8962f6df83240ce03517 we are calculating
coverage using Codecov via CircleCI

cjohansen/Sinon.JS,mroderick/Sinon.JS,mroderick/Sinon.JS,mroderick/Sinon.JS,cjohansen/Sinon.JS,cjohansen/Sinon.JS