chore: bump release version to 2.8.1 #612

Job	Run time
Check CMake usage (NUCLEO_F091RC)	44s
Check CMake usage (NUCLEO_F103RB)	40s
Check CMake usage (NUCLEO_F207ZG)	41s
Check CMake usage (NUCLEO_F303RE)	45s
Check CMake usage (NUCLEO_F411RE)	40s
Check CMake usage (NUCLEO_F767ZI)	44s
Check CMake usage (NUCLEO_G0B1RE)	43s
Check CMake usage (NUCLEO_G474RE)	42s
Check CMake usage (NUCLEO_H563ZI)	46s
Check CMake usage (NUCLEO_H743ZI2)	44s
Check CMake usage (NUCLEO_L073RZ)	39s
Check CMake usage (NUCLEO_L152RE)	40s
Check CMake usage (NUCLEO_L476RG)	42s
Check CMake usage (NUCLEO_L552ZE_Q)	34s
Check CMake usage (NUCLEO_U575ZI_Q)	36s
Check CMake usage (P_NUCLEO_WB55RG)	42s
Check CMake usage (NUCLEO_WBA55CG)	39s
Check CMake usage (NUCLEO_WL55JC1)	33s
	12m 14s

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