[SYS] Bump ESP8266 framework version to 4.2.1 (#2102)

Co-authored-by: Florian <1technophile@users.noreply.github.com>

platformio.ini

@@ -175,7 +175,7 @@ build_flags =
 monitor_speed = 115200
 
 [com]
-esp8266_platform = espressif8266@4.1.0
+esp8266_platform = espressif8266@4.2.1
 esp32_platform = espressif32@6.1.0
 esp32_solo_platform = https://github.com/tasmota/platform-espressif32/releases/download/2023.02.00/platform-espressif32.zip
 atmelavr_platform = atmelavr@3.3.0