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

Summary:
Pull Request resolved: #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

Author: cortinico

.github/workflows/test-all.yml

@@ -593,8 +593,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        node-version: ["24", "22"]
-        # node-version: ["24", "22", "20.19.4"]
+        node-version: ["24", "22", "20.19.4"]
     steps:
       - name: Checkout
         uses: actions/checkout@v4