test: fix github matrix os for testing

Author: andreafassina

.github/workflows/test.yml

@@ -28,7 +28,7 @@ jobs:
         os:
           - ubuntu-latest
           - windows-latest
-        node: [12.x, 14.x, 16.x]
+        node: [14.x, 16.x, 18.x]
 
     steps:
       - uses: actions/checkout@v2