CI: Add explicit node version to jobs

[champ24-36]

This PR adds an explicit node-version key to each job in the CI workflow. This ensures consistent behavior across different runners and avoids potential issues caused by relying on the default node version. It also improves reproducibility.

Specifically, I've added node-version: 18 to all relevant jobs. This version is currently used by the project and is a good balance of stability and features.

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