build: Drop Node v12 support, add v18

Author: buffcode

.github/workflows/nodejs.yml

@@ -11,7 +11,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        node-version: ['12', '14', '16']
+        node-version: ['14', '16', '18']
     steps:
       - uses: actions/checkout@v2
       - name: Use Node.js ${{ matrix.node-version }}

package.json

@@ -42,6 +42,6 @@
     "printWidth": 120
   },
   "engines": {
-    "node": "^12 || ^14 || ^16"
+    "node": "^14 || ^16 || ^18"
   }
 }