chore: upgrade TypeScript to 3.8 (#5566)
chore: upgrade TypeScript to 3.8 (#5566)

Easy upgrade this one! No changes that affect us so this change simply bumps TS in `package.json`.
GoogleChrome/puppeteer,GoogleChrome/puppeteer,puppeteer/puppeteer,puppeteer/puppeteer,puppeteer/puppeteer,GoogleChrome/puppeteer,puppeteer/puppeteer