fix(firebase): Use a Set for supported node versions

[luc122c]

🔗 Linked issue

❓ Type of change

• 📖 Documentation (updates to the documentation or readme)
• 🐞 Bug fix (a non-breaking change that fixes an issue)
• 👌 Enhancement (improving an existing functionality like performance)
• ✨ New feature (a non-breaking change that adds functionality)
• ⚠️ Breaking change (fix or feature that would cause existing functionality to change)

📚 Description

Error:   69:9  error  `supportedNodeVersions` should be a `Set`, and use `supportedNodeVersions.has()` to check existence or non-existence  unicorn/prefer-set-has

Pr #925 introduced a lint error. This PR fixes it.

📝 Checklist

• I have linked an issue or discussion.
• I have updated the documentation accordingly.

[luc122c]

@pi0 this should fix the CI error I introduced.

[pi0]

Pushed to main before see your pr. thanks anyway :)