Update workflow to use latest webpack 5 beta
Update workflow to use latest webpack 5 beta

JeromeFitz/next.js,JeromeFitz/next.js,zeit/next.js,zeit/next.js,flybayer/next.js,azukaru/next.js,JeromeFitz/next.js,azukaru/next.js,flybayer/next.js,azukaru/next.js,flybayer/next.js,azukaru/next.js,flybayer/next.js,zeit/next.js,JeromeFitz/next.js