Fix CI by pinning Node to 22.17.1

[12joan]

It looks like CI was broken with the release of Node 22.18.0.

This PR patches the issue by pinning to 22.17.1, but we should look into fixing compatibility with later Node versions.

file:///home/runner/work/slate/slate/packages/slate/test/interfaces/CustomTypes/custom-types.ts:2
  BaseEditor,
  ^^^^^^^^^^
SyntaxError: Named export 'BaseEditor' not found. The requested module 'slate' is a CommonJS module, which may not support all module.exports as named exports.
CommonJS modules can always be imported via the default export, for example using:

import pkg from 'slate';

[changeset-bot]

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