Drop Arduino Core 2 support

Author: mathieucarbou

.github/workflows/ci.yml

@@ -49,17 +49,6 @@ jobs:
       fail-fast: false
       matrix:
         include:
-          - platform: [email protected]
-            board: esp32dev
-          - platform: [email protected]
-            board: esp32-s2-saola-1
-          - platform: [email protected]
-            board: esp32-s3-devkitc-1
-          - platform: [email protected]
-            board: esp32-c3-devkitc-02
-          - platform: [email protected]
-            board: esp32-gateway
-
           - platform: https://github.com/pioarduino/platform-espressif32/releases/download/54.03.20/platform-espressif32.zip
             board: esp32dev
           - platform: https://github.com/pioarduino/platform-espressif32/releases/download/54.03.20/platform-espressif32.zip