ci: drop Node.js 12 14

Author: pionxzh

.github/workflows/main.yml

@@ -12,7 +12,7 @@ jobs:
     runs-on: ${{ matrix.os }}
     strategy:
       matrix:
-        node_version: ['12', '14', '16', '18', '20']
+        node_version: ['16', '18', '20']
         os: [ubuntu-latest]
 
     steps: