Update webdriverio to v7

[Kamahl19]

webdriverio v6 is failing with Puppeteer 8 due to it's own TS types. webdriverio v7 is using new puppeteer-core which does not bring old @types/puppeteer.

My TS build is failing due to doubled puppeteer types when using puppeteer v8

[seanpoulter]

Would you welcome a PR for this team?

[conmute]

Overcoming this issue by using ovverrides

see: https://docs.npmjs.com/cli/v8/configuring-npm/package-json#overrides

in package.json:

  "overrides": { 
    "webdriver": "^8.32.3",
    "webdriverio": "^8.32.3",
    "saucelabs": "^4.7.8" // need this because its a dependency as well
  },

I could also use latest saucelabs here, which is 7.5.0