ci: remove node 16 support

Author: gzeoneth

.github/workflows/audit-ci.yml

@@ -15,7 +15,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        node-version: [16, 18, 20]
+        node-version: [18, 20]
     steps:
       - name: Checkout
         uses: actions/checkout@v3