chore: upgrade the ci to node20 to avoid warnings

[WindRunnerMax]

Description
We're using a really old version of Node (12), and then it got bumped to the oldest available version (16), which might still be too old.

Example
Now Node has been upgraded to the latest version. You can check the link.

https://github.com/ianstormtaylor/slate/pull/5743/checks

Checks

• The new code matches the existing patterns and styles.
• The tests pass with yarn test.
• The linter passes with yarn lint. (Fix errors with yarn fix.)
• The relevant examples still work. (Run examples with yarn start.)
• You've added a changeset if changing functionality. (Add one with yarn changeset add.)

[changeset-bot]

⚠️ No Changeset found

Latest commit: bd0ad14

Merging this PR will not cause a version bump for any packages. If these changes should not result in a new version, you're good to go. If these changes should result in a version bump, you need to add a changeset.

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