Arduino core 3.1.3

* core 3.1.3

* Update platform.json

* Update README.md

Author: Jason2866

README.md

@@ -20,7 +20,7 @@ ESP32 is a series of low-cost, low-power system on a chip microcontrollers with
 1. Configure a platform option in platformio.ini file:
 
 ### Stable Arduino
-currently espressif Arduino 3.1.2 and IDF 5.3.2.250210
+currently espressif Arduino 3.1.3 and IDF 5.3.2.250210
 
 ```ini
 [env:stable]

platform.json

@@ -18,7 +18,7 @@
     "type": "git",
     "url": "https://github.com/pioarduino/platform-espressif32.git"
   },
-  "version": "53.03.12",
+  "version": "53.03.13",
   "frameworks": {
     "arduino": {
       "script": "builder/frameworks/arduino.py"
@@ -33,7 +33,7 @@
       "type": "framework",
       "optional": true,
       "owner": "espressif",
-      "version": "https://github.com/espressif/arduino-esp32/releases/download/3.1.2/esp32-3.1.2.zip"
+      "version": "https://github.com/espressif/arduino-esp32/releases/download/3.1.3/esp32-3.1.3.zip"
     },
     "framework-arduinoespressif32-libs": {
       "type": "framework",