Exclude Node.js and npm update from `eslint-app.json5` configuration

[lumirlumir]

This issue was prompted by eslint/eslint.org#825 (comment); I extracted the main point from that comment.

Currently, some repositories, such as eslint.org, eslint-github-bot, and code-explorer, perform version updates for engines.node, npm, or .nvmrc.

References:

• chore: update node.js to v20.19.5 - autoclosed eslint.org#825
• chore: update npm to v10.9.4 - autoclosed eslint-github-bot#253
• chore: update node.js to v22.21.1 - autoclosed eslint-github-bot#252
• chore: update node.js to v20.19.5 - autoclosed code-explorer#215

Only the repositories using eslint-app.json5 are affected.

The node and npm versions are used to define the development environment, so personally I think they're not strictly necessary and tend to create clutter. So, I propose not updating node- or npm-related dependencies via Renovate.

Ref: (eslint-app.json5) https://github.com/eslint/workflows/blob/main/.github/renovate/eslint-app.json5

[eslint-github-bot]

👋 Hi! This issue is being addressed in pull request #34. Thanks, @lumirlumir!

[nzakas]

Makes sense to me.