Drop Node 12.x support

Author: nene

.github/workflows/webpack.yaml

@@ -10,7 +10,7 @@ jobs:
 
     strategy:
       matrix:
-        node-version: [12.x, 14.x, 16.x]
+        node-version: [14.x, 16.x]
 
     steps:
       - uses: actions/checkout@v2