Jamie Fox authored Jan 05, 2023 and Anton Komlev committed Jan 17, 2023

The BL1 signing scripts do not work with old versions of the Python
cryptography package, so specify a minimum version in the
requirements.txt to cause an upgrade in the case that the user already
has an old version installed.

Also bump up the minimum imgtool package version to the one that matches
the MCUBoot version used in TF-M.

Signed-off-by: Jamie Fox <jamie.fox@arm.com>
Change-Id: Iba15cd4536315987bd3c97efeddd56030d6049cd