chore: update STM32Cube_FW from Cube version v1.15.0

Signed-off-by: Frederic Pillon <[email protected]>

Author: fpistm

src/utility/STM32Cube_FW/README.md

@@ -1,6 +1,6 @@
 
 ## Source
 
-[STMicroelectronics/STM32CubeWB Release v1.14.0](https://github.com/STMicroelectronics/STM32CubeWB/releases/tag/v1.14.0)
-- Application: [BLE_TransparentMode](https://github.com/STMicroelectronics/STM32CubeWB/tree/v1.14.0/Projects/P-NUCLEO-WB55.Nucleo/Applications/BLE/BLE_TransparentMode)
+[STMicroelectronics/STM32CubeWB Release vv1.15.0](https://github.com/STMicroelectronics/STM32CubeWB/releases/tag/vv1.15.0)
+- Application: [BLE_TransparentMode](https://github.com/STMicroelectronics/STM32CubeWB/tree/vv1.15.0/Projects/P-NUCLEO-WB55.Nucleo/Applications/BLE/BLE_TransparentMode)