Upgrade dependencies and fix security alerts

[daniel-wer]

Although github only showed 5 alerts, yarn audit complained about >85 vulnerable packages. Fortunately, a yarn upgrade (which updates all packages as far as it is allowed by the package.json) fixed most of these issues. Of course there were libs that introduced breaking changes in minor versions (looking at you airbrake-js - that's why I needed to include the cross-fetch dependency).
There is one remaining alert by yarn audit, but there is an open PR in the library's repo which we should get via yarn upgrade in the next weeks.

I did some testing by myself and couldn't find any major issues.
Not sure whether we should execute the testing protocol, but as the libs with major version updates were all devDependencies, I would hope we won't need to execute it.

Related note: We should probably run yarn upgrade more often, it removed lots of very old package versions which should benefit the bundle size as well :)
(I checked out of interest and can confirm: vendor-bundle got ~20% smaller locally - from 27MB to 22MB)

URL of deployed dev instance (used for testing):

• https://fixvulnerablepackages.webknossos.xyz

Steps to test:

• Run yarn audit.

Issues:

• fixes Fix security alerts #3838

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• Ready for review

[philippotto]

Awesome 💯

[philippotto]

For the record: We decided to merge this on Thursday.