chore(deps): update eslint to 9.2.0

[MikeMcC399]

Situation

The installed base version of ESLint is eslint@8.57.0

CI circle.yml does however temporarily install each supported version ESLint v7, v8 and v9 during testing with Jest.

The repo is compatible with ESLint v9 and can be updated.

Change

Update the installed base version of ESLint to eslint@9.2.0 (latest).

Verification

npm ci
npm run lint
npm test

[cypress-app-bot]

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[MikeMcC399]

Leaving this in draft state at the moment, although I don't know of any reason why it couldn't be merged.

[MikeMcC399]

@jennifer-shehane

I've just about reached the end of my level of competency now and I should probably let somebody else take the lead for the full migration to ESLint Flat Config which involves a lot of manipulation of JavaScript data structures that I am only vaguely familiar with. That was already my impression when I started the work. I did however manage to do a lot more than I thought I would be able to do! 🙂 (Total of 39 PRs)