bsp:stm32：Add reminder for missing dependency packages #6047

Job	Run time
generate-matrix	7s
RT-Thread Online Packages (STM32F407 RT-Spark)	5m 32s
stm32_f2_f4	9m 13s
stm32f0_f1	4m 1s
stm32l4	9m 12s
RTduino_Arduino Libraries (STM32F412 Nucleo)	9m 15s
stm32_f7_g0_h7_mp15_u5_h5_wb5	6m 30s
llvm-arm	3m 35s
collect-artifacts	0s
	47m 25s

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