feat: drop support for Node 12

BREAKING CHANGE: Node v14.15 (LTS) or greater is now required.

Author: tido64

package.json

@@ -133,6 +133,9 @@
     "suggestion-bot": "^1.0.0",
     "typescript": "^4.0.0"
   },
+  "engines": {
+    "node": ">=14.15"
+  },
   "packageManager": "[email protected]",
   "resolutions": {
     "@commitlint/is-ignored/semver": "^7.3.5",