Also test node 20.19.4 in the test_js matrix (#52878)

Summary:
Pull Request resolved: https://github.com/facebook/react-native/pull/52878

Now that Metro is bumped to also support node >= 20.19.4
we should be able to run test_js on `main` against 20.19.4

Changelog:
[Internal] [Changed] -

Reviewed By: robhogan, motiz88

Differential Revision: D79087608

fbshipit-source-id: 2161a893ab2fd88dc7eb1b35aa385704962018e8