Update development tools

[ooflorent]

• Update eslint (and its plugins), prettier and some minor deps
• Fix YAML formatting

What kind of change does this PR introduce?

build related change

Did you add tests for your changes?

no

Does this PR introduce a breaking change?

no

What needs to be documented once your changes are merged?

n/a

[webpack-bot]

For maintainers only:

• This need to be documented (issue in webpack/webpack.js.org will be filed when merged)

[webpack-bot]

Thank you for your pull request! The most important CI builds succeeded, we’ll review the pull request soon.

[sokra]

Thanks