chore: bump Node.js requirement to >=20

Varadraj75 · Varadraj75 · commit c6fd7db61f9f · 2026-01-20T18:25:09.000+05:30
diff --git a/.nvmrc b/.nvmrc
@@ -1 +1 @@
-v18
+v20
diff --git a/package.json b/package.json
@@ -8,7 +8,7 @@
     "url": "https://github.com/asyncapi/modelina/issues"
   },
   "engines": {
-    "node": ">=18"
+    "node": ">=20"
   },
   "repository": {
     "type": "git",
