fix: update min node to v18 (#2767)

BREAKING CHANGE: minimum supported node version v18

.github/workflows/tests.yml

@@ -13,7 +13,7 @@ jobs:
     strategy:
       matrix:
         # lowest verison here should also be in `engines` field
-        node_version: [12, 'lts/*', '*']
+        node_version: [18, 'lts/*', '*']
     runs-on: ubuntu-latest
     steps:
       - name: Checkout Code

package.json

@@ -88,6 +88,6 @@
     "minify": "uglifyjs lib/marked.umd.js -cm  --comments /Copyright/ -o marked.min.js"
   },
   "engines": {
-    "node": ">= 12"
+    "node": ">= 18"
   }
 }