This commit updates the trustfence-stm-signtools package with the latest
versions from the STM32 MPU ecosystem v6.1.0:
- STM32MP_KeyGen_CLI v2.20.0
- STM32MP_SigningTool_CLI v2.20.0
These tools are deployed as part of STM32CubeProgrammer v2.20.0, adding support
for STM32MP21x processors and bug fixing.
Signed-off-by: Arturo Buzarra <arturo.buzarra@digi.com>