cli: add update command

[abiosoft]

This introduces the colima update command to update the container runtime version without requiring a new version of Colima.

$ colima update --help
Update the current container runtime.

Usage:
  colima update [profile] [flags]

Aliases:
  update, u, up

Flags:
  -h, --help   help for update

Global Flags:
  -p, --profile string   profile name, for multiple instances (default "default")
  -v, --verbose          enable verbose log
      --very-verbose     enable more verbose log