Update Firecracker from v0.24.2 to v0.24.3

This is a patch release introducing the following changes:
1.Changed Docker images repository from DockerHub to Amazon ECR.
2.Snapshot related host files (vm-state, memory, block backing files) are now flushed to their backing mediums as part of the CreateSnapshot operation.
3.Fixed ballooning API definition by renaming all fields which mentioned "MB" to use "MiB" instead.

Signed-off-by: Royce Zhao <[email protected]>

Author: RoyceDavison