dockerfile: Adding cmsis-pack-utils prerequisites to Docker Image

- Adding cmsis-toolbox package to the SDK's DevContainer
Docker image.

- Fixing yq YAML to JSON converter installation as when being
installed by pip it seems like an older version is being
downloaded rather than the latest version in which that old version
is not being recognized by cmsis-pack-utils library.

Signed-off-by: Ahmed.Ismail <Ahmed.Ismail@arm.com>