🛠️ Repo: `npm i` with Node 22.21.1 gives EBADENGINE for `npm-run-all2`

### Tooling Suggestion Checklist - [x] I have tried restarting my IDE and the issue persists. - [x] I have pulled the latest `main` branch of the repository. - [x] I have read and agree to Mocha's [Code of Conduct](https://github.com/mochajs/mocha/blob/main/.github/CODE_OF_CONDUCT.md) and [Contributing Guidelines](https://github.com/mochajs/mocha/blob/main/.github/CONTRIBUTING.md) - [x] I have searched for [related issues](https://github.com/mochajs/mocha/issues?q=is%3Aissue) and [issues with the `faq` label](https://github.com/mochajs/mocha/issues?utf8=%E2%9C%93&q=is%3Aissue%20label%3Afaq%20), but none matched my issue. - [x] I want to provide a PR to resolve this ### Overview I merged #6019 which I didn't notice had a breaking change to only support Node 22.22+. This goes against Mocha's engine of 20.19+ and although it only impacts contributors to Mocha, it's worth a fix. ### Additional Info The PR description of #6019 does not note the engine change. We need to be more careful in reviewing these changes going forward.