Update platform.json

Author: Jason2866

platform.json

@@ -18,7 +18,7 @@
     "type": "git",
     "url": "https://github.com/pioarduino/platform-espressif32.git"
   },
-  "version": "54.03.20+develop",
+  "version": "54.03.21",
   "frameworks": {
     "arduino": {
       "script": "builder/frameworks/arduino.py"