Change yml to STM32 Gen F4 to avoid '.rodata' will not fit in region `FLASH'

Author: PaulZC

Diff for: .github/workflows/compile-sketch.yml

@@ -79,7 +79,7 @@ jobs:
 
           # STM32
           # https://github.com/arduino/ArduinoCore-mbed/blob/master/boards.txt
-          - fqbn: STMicroelectronics:stm32:GenF1
+          - fqbn: STMicroelectronics:stm32:GenF4
             platforms: |
               - name: STMicroelectronics:stm32
                 source-url: https://github.com/stm32duino/BoardManagerFiles/raw/main/package_stmicroelectronics_index.json