updated coveralls github action to node v 20

.github/workflows/code-coverage.yml

@@ -9,15 +9,15 @@ jobs:
         steps:
             - uses: actions/checkout@v1
 
-            - name: Use Node.js 16.x
+            - name: Use Node.js 20.x
               uses: actions/setup-node@v3
               with:
-                  node-version: 16.x
+                  node-version: 20.x
 
             - name: npm install, make test-coverage
               run: |
                   npm install
                   make test-coverage
 
             - name: Coveralls
-              uses: coverallsapp/github-action@v2
+              uses: coverallsapp/github-action@v2.3.0