Update ci-cd.yml

Update to Ubuntu 20.04 version for ci-cd builds

Author: bhufmann

.github/workflows/ci-cd.yml

@@ -19,7 +19,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        os: [ubuntu-18.04]
+        os: [ubuntu-20.04]
         node: [16.x]
 
     steps: