bsp:stm32：Add reminder for missing dependency packages #6132

Job	Run time
generate-matrix	7s
RT-Thread Online Packages (STM32F407 RT-Spark)	6m 3s
llvm-arm	3m 50s
stm32_f2_f4	9m 18s
stm32l4	9m 44s
stm32f0_f1	5m 14s
stm32_f7_g0_h7_mp15_u5_h5_wb5	6m 39s
collect-artifacts	0s
	40m 55s

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