Specify pack version range

[ReinhardKeil]

To ensure that latest pack versions are picked-up, use in cproject.yml files this syntax:

  packs:
    - pack: ARM::CMSIS@^6.1.0
    - pack: ARM::CMSIS-DSP@^1.16.0
    - pack: ARM::CMSIS-NN@^7.0.0
    - pack: ARM::CMSIS-Compiler@^2.1.0