Adjust node versions for github workflow

Author: MichalLytek

.github/workflows/main.yml

@@ -14,7 +14,7 @@ jobs:
 
     strategy:
       matrix:
-        node-version: [16.x, 17.x, 18.x, 19.x]
+        node-version: [18.x, 19.x, 20.x, 21.x]
 
     services:
       db: