Add node.js 20 to CI, drop node.js 12 support

PR-URL: #459

Author: tshemsedinov

.github/workflows/test.yml

@@ -9,11 +9,11 @@ jobs:
     strategy:
       matrix:
         node:
-          - 12
           - 14
           - 16
           - 18
           - 19
+          - 20
         os:
           - ubuntu-latest
           - windows-latest

package.json

@@ -48,7 +48,7 @@
     "prepublish": "npm run -s build"
   },
   "engines": {
-    "node": ">=12.0.0"
+    "node": ">=14.0.0"
   },
   "dependencies": {
     "@metarhia/common": "^2.2.1"