build: add extra test for Node 20, update windows tests (#1828)

* build: add extra test for Node 20, update windows tests

Author: sofisl

synthtool/gcp/templates/node_library/.github/workflows/ci.yaml

@@ -9,7 +9,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        node: [{{metadata['engine'] | int}}, {{metadata['engine'] | int+2}}, {{metadata['engine'] | int+4}}]
+        node: [{{metadata['engine'] | int}}, {{metadata['engine'] | int+2}}, {{metadata['engine'] | int+4}}, {{metadata['engine'] | int+6}}]
     steps:
       - uses: actions/checkout@v3
       - uses: actions/setup-node@v3