Update shiplift crate - virtual_size optional field of docker image a…

[aditijannu]

…ttributes

Issue:
The following converter error was noticed:

[2024-03-13T21:47:27Z WARN  container_converter::docker] Encountered error when searching for local image parent-base. SerdeJsonError(Error("missing field `VirtualSize`", line: 1, column: 2749)).
[2024-03-13T21:47:27Z ERROR container_converter] Converter exited with error: Failed retrieving requisite parent-base image. "Image parent-base not found in local repository."
Error: "Failed retrieving requisite parent-base image. \"Image parent-base not found in local repository.\""

Upon looking into the docker 24.0 release notes, it's seen that virtual_size field is deprecated (https://docs.docker.com/engine/release-notes/24.0/) and may not longer be provided by the docker daemon. To fix the above error, an update in the shiplift crate used by the converter was required - fortanix/shiplift#10

This PR picks up the latest changes from the shiplift crate and ensures virtual_size is used as an optional parameter.

[aditijannu]

Included changes from this PR in aj/SALM-561 branch. Closing this branch.