[chore] Run coveralls CI check on Node 20 not 16 (#2418)

Author: DABH

.github/workflows/ci.yml

@@ -40,7 +40,7 @@ jobs:
       - name: Test Coverage
         run: npm run test:coverage
       - name: Report test coverage to Coveralls.io
-        if: matrix.node == '16'
+        if: matrix.node == '20'
         uses: coverallsapp/github-action@master
         with:
           github-token: ${{ secrets.GITHUB_TOKEN }}