Improve update of indirect dependencies from Sitespeed

[7h3Rabbit]

Feature/improvement

We indirectly inherit dependencies from browsertime (read: Sitespeed) today but we have no automatic way of ensuring we use same version when sitespeed is updated.

• In https://github.com/sitespeedio/sitespeed.io/blob/v34.11.0/package.json we can read browsertime version under dependencies.browsertime
• In https://github.com/sitespeedio/browsertime/blob/v22.10.0/package.json we can read selenium version under dependencies.selenium-webdriver

We still need to figure out a way to read:

• pillow version
• opencv-python version
• numpy version