BREAKING: Drop Node 12 support (#438)

Author: RyanZim

.github/workflows/ci.yml

@@ -8,7 +8,7 @@ jobs:
   test:
     strategy:
       matrix:
-        node: [12, 14, 16]
+        node: [14, 16, 18]
         os: [ubuntu-latest, windows-latest]
     runs-on: ${{ matrix.os }}
     steps:

package.json

@@ -4,7 +4,7 @@
   "description": "CLI for PostCSS",
   "type": "module",
   "engines": {
-    "node": ">=12"
+    "node": ">=14"
   },
   "bin": {
     "postcss": "./index.js"