Use arduinoststm32 3.x for FYSETC S6 (#17131)

platformio.ini

 [env:FYSETC_S6]
 platform          = ststm32
 board             = fysetc_s6
-platform_packages = tool-stm32duino
+platform_packages =
+   tool-stm32duino
+   framework-arduinoststm32@>=3.107,<4
 build_flags       = ${common.build_flags}
   -DTARGET_STM32F4 -std=gnu++14
   -DVECT_TAB_OFFSET=0x10000