Linting is broken in master

Noticed npm run lint is broken in master. Root cause is recent eslint upgrade from v8 to v10. New version does no longer support .eslintrc.json or .eslintignore. I'm submitting a PR very soon.

These kind of things happen when not using automated validation pipelines. I'd recommend setting up one. I can submit a PR for it if you'd like.

~/code/phaser$ npm run lint

> phaser@4.1.0 lint
> eslint --config .eslintrc.json "src/**/*.js"

(node:534) ESLintIgnoreWarning: The ".eslintignore" file is no longer supported. Switch to using the "ignores" property in "eslint.config.js": https://eslint.org/docs/latest/use/configure/migration-guide#ignore-files
(Use `node --trace-warnings ...` to show where the warning was created)

Oops! Something went wrong! :(

ESLint: 10.2.0

TypeError [ERR_IMPORT_ATTRIBUTE_MISSING]: Module "file:///home/niklas/code/phaser/.eslintrc.json?mtime=1778942736943" needs an import attribute of "type: json"
    at validateAttributes (node:internal/modules/esm/assert:88:15)
    at defaultLoadSync (node:internal/modules/esm/load:164:3)
    at #loadAndMaybeBlockOnLoaderThread (node:internal/modules/esm/loader:796:12)
    at #loadSync (node:internal/modules/esm/loader:816:49)
    at ModuleLoader.load (node:internal/modules/esm/loader:781:26)
    at ModuleLoader.loadAndTranslate (node:internal/modules/esm/loader:526:31)
    at #getOrCreateModuleJobAfterResolve (node:internal/modules/esm/loader:577:36)
    at afterResolve (node:internal/modules/esm/loader:625:52)
    at ModuleLoader.getOrCreateModuleJob (node:internal/modules/esm/loader:631:12)
    at onImport.tracePromise.__proto__ (node:internal/modules/esm/loader:650:32)

Start with the npm run lint script and the referenced .eslintrc.json and .eslintignore files. Read ESLint's migration guidance for eslint.config.js, then verify that npm run lint completes without the reported error or ignore-file warning.