.eslintrc.js is about to be deprecated

[domoscargin]

What

We're using an .eslintrc.js file to configure our eslint. This is due to be deprecated in eslint 9.0.0, and has caused some issues with eslint plugins.

We should look into updating to the new eslint.config.js style.

Who needs to work on this

Developer

Who needs to review this

Developer

Done when

• Our eslint config is in the new style.
• We've reverted the changes to the dependabot config ignoring ESLint and its plugins

[romaricpascal]

It seems ESLint and its plugin are struggling to get updated by Dependabot. Suspecting this is because of some requiring the new config format while we're stuck on the old format, so that's a change we may want to do sooner rather than later.