hal_stm32 : stm32wbax: Link Layer url versioning fragility reference

[vtardy-st]

The url specified in the module.yml for the WBA6_LinkLayer15_4_Zephyr.a and WBA6_LinkLayer_Thread_lib_Zephyr.a libraries takes the main branch as reference.
This url format generates a fragility about the association of zephyr and hal_stm32 to a specific historical version of the libraries. Only the last pushed version could be fetched.

In order to fix this fragility, the 'main' in the url should be replaced by the SHA-1 of the commit corresponding to the version of the libraries.

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[etienne-lms]

I think this issues should be addressed before v4.3 final tag is released. The blob reference in the HAL module is too fragile and zephyrproject-rtos/hal_stm32#324 would ensure the right blob is fetched.