Speed up `update-db` tests

[ialarmedalien]

The update-db tests use repos with quite a few dependencies (autoprefixer, postcss-*...). The tests could run more quickly if some less dependency-heavy repos were used -- e.g. caniuse-on-user-agent, caniuse-support, caniuse-api, browserslist-ga. Alternatively, if you want to keep everything "in house", create some npm packages with a bare minimum of content and dependencies (including caniuse-lite) and use those.

[ai]

I agree. It is a good idea. You can add it to your PR (Sorry, I will not be able to review your PR today).

[ialarmedalien]

No problem on not reviewing the PR today. Do you have a preference for which strategy is used -- existing repos vs create testing use only npm modules?

[ai]

I think it will be better to use real dependencies