pio: git toolchain version bump

see https://github.com/esp8266/Arduino/issues/7792#issuecomment-750861423

code/platformio.ini

@@ -123,8 +123,8 @@ debug_flags =
 shared_libdeps_dir = libraries/
 
 git_platform_packages =
-    framework-arduinoespressif8266 @ https://github.com/esp8266/Arduino.git
-    mcspr/toolchain-xtensa @ 5.100200.200918
+    platformio/framework-arduinoespressif8266 @ https://github.com/esp8266/Arduino.git
+    mcspr/toolchain-xtensa @ 5.100200.201223
 
 lib_deps =
     https://github.com/me-no-dev/ESPAsyncTCP.git#7e9ed22