Update eslint to be compatible with Wikibase .eslintrc

[jakobw]

Running eslint from extensions/Wikibase/view/lib/wikibase-data-model fails due to the eslint versions being out sync.

> wikibase-data-model@4.0.0 eslint extensions/Wikibase/view/lib/wikibase-data-model
> eslint .

extensions/Wikibase/.eslintrc.json:
	Configuration for rule "indent" is invalid:
	Value "off" is the wrong type.

Error: extensions/Wikibase/.eslintrc.json:
	Configuration for rule "indent" is invalid:
	Value "off" is the wrong type.

[manicki]

shouldn't Wikibase's eslint just ignore all lib directories from linting (same it does not run lib's unit tests etc). Or do I misread the description?

[jakobw]

@manicki If I understand it correctly, it's the other way around: eslint goes up the directory tree looking for "parent" .eslintrc files to inherit from. An alternative would probably be to set the root: true option to prevent it from doing so https://eslint.org/docs/user-guide/configuring#using-configuration-files