update arduino IDE from 1.8.13 to 1.8.15

Author: Links2004

.github/workflows/main.yml

@@ -42,10 +42,10 @@ jobs:
           get_sketches_json_matrix arduino $GITHUB_WORKSPACE/examples/esp8266 esp8266 1.6.13 esp8266com:esp8266:generic:xtal=80,dbg=Serial1
           echo -en ","
 
-          get_sketches_json_matrix arduino $GITHUB_WORKSPACE/examples/esp8266 esp8266 1.8.13 esp8266com:esp8266:generic:xtal=80,eesz=1M,FlashMode=qio,FlashFreq=80
+          get_sketches_json_matrix arduino $GITHUB_WORKSPACE/examples/esp8266 esp8266 1.8.15 esp8266com:esp8266:generic:xtal=80,eesz=1M,FlashMode=qio,FlashFreq=80
           echo -en ","
 
-          get_sketches_json_matrix arduino $GITHUB_WORKSPACE/examples/esp32 esp32 1.8.13 espressif:esp32:esp32:FlashFreq=80
+          get_sketches_json_matrix arduino $GITHUB_WORKSPACE/examples/esp32 esp32 1.8.15 espressif:esp32:esp32:FlashFreq=80
 
           echo -en "]"
     outputs:
@@ -56,7 +56,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        IDE_VERSION: [1.8.13, 1.6.13]
+        IDE_VERSION: [1.8.15, 1.6.13]
     env:
       IDE_VERSION: ${{ matrix.IDE_VERSION }}