feat: support eslint v9 through @eslint/eslintrc

[MikeMcC399]

This PR releases the plugin for use on ESLint 9.x in addition to 7.x and 8.x
It provides also a minimal documentation update necessary to support this addition

Issue

The [email protected] release was blocked from installing on eslint >= 9 through peerDependencies

eslint-plugin-cypress/package.json

Lines 21 to 23 in dc22026

	"peerDependencies": {
	"eslint": ">=7 <9"
	},

Related resolutions

• An API compatibility issue with ESLint v9 was resolved in the [email protected] release
• PR docs: add document for FlatCompat use #201 added documentation to describe how to use the plugin with a Flat config, which is the default for ESLint v9.

Change

• peerDependencies are relaxed to allow installation on any version starting with eslint@7 and including eslint@9.
• The README and FLAT-CONFIG documents are updated to cover use of the plugin on all supported versions: v7, v8 and v9

ESLint version	legacy .eslintrc.*	flat config eslint.config.*js
v7	supported	not available
v8	supported	supported (1)
v9	supported (2)	supported (1)

(1) Supported through the FlatCompat class of @eslint/eslintrc
(2) Deprecated by ESLint v9. Can be used with environment variable ESLINT_USE_FLAT_CONFIG set to false

[cypress-app-bot]

• Create a Draft Pull Request if your PR is not ready for review. Mark the PR as Ready for Review when you're ready for a Cypress team member to review the PR.

[MikeMcC399]

Preview

• README > Installation
• README > Usage
• FLAT-CONFIG

[MikeMcC399]

• Although this repo is not yet capable of running tests with ESLint 9.x, I ran PR fix: clean unused eslint disables cypress-example-kitchensink#837 using ESLint 9.x and I have a branch in preparation where the internal tests (with modifications to the tests, not the rules) run successfully on ESLint 9.x.

[cypress-app-bot]

🎉 This PR is included in version 3.2.0 🎉

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

Your semantic-release bot 📦🚀

[MikeMcC399]

• Info noted in 📈 Tracking: ESLint v9 support eslint/eslint#18391