⬆️ Update node-red-node-serialport to v2.0.3 (#1920)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

node-red/package.json

@@ -30,7 +30,7 @@
     "node-red-node-feedparser": "0.3.0",
     "node-red-node-ping": "0.3.3",
     "node-red-node-random": "0.4.1",
-    "node-red-node-serialport": "2.0.2",
+    "node-red-node-serialport": "2.0.3",
     "node-red-node-smooth": "0.1.2",
     "node-red-node-suncalc": "1.1.2",
     "node-red-node-twitter": "1.2.0",