Use var for constant and move to other constants

Author: Jason2866

platform.py

@@ -35,6 +35,7 @@
 MKLITTLEFS_VERSION_400 = "4.0.0"
 DEFAULT_DEBUG_SPEED = "5000"
 DEFAULT_APP_OFFSET = "0x10000"
+ARDUINO_ESP32_PACKAGE_URL = "https://raw.githubusercontent.com/espressif/arduino-esp32/master/package/package_esp32_index.template.json"
 
 # MCUs that support ESP-builtin debug
 ESP_BUILTIN_DEBUG_MCUS = frozenset([
@@ -310,11 +311,8 @@ def _configure_arduino_framework(self, frameworks: List[str]) -> None:
         self.packages["framework-arduinoespressif32-libs"]["optional"] = False
 
         if is_internet_available():
-            # Use branch master
-            url = ("https://raw.githubusercontent.com/espressif/arduino-esp32/"
-                   "master/package/package_esp32_index.template.json")
             try:
-                response = requests.get(url, timeout=30)
+                response = requests.get(ARDUINO_ESP32_PACKAGE_URL, timeout=30)
                 response.raise_for_status()
                 packjdata = response.json()
                 dyn_lib_url = packjdata['packages'][0]['tools'][0]['systems'][0]['url']