Add Node 21 to CI

[drwpow]

Changes

Adds Node v21 to the CI test suite to ensure compat when v22 gets its first stable release.

How to Review

• CI should pass

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Latest commit: 5d4912a

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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