Minor bug fix on MFT version comparisons.

When there are multiple MFT version available, there is a minor bug in the comparison logic and would resulted in the following failrue:

  File "/app/gce-cos-nvidia-bug-report.py", line 740, in IdentifyMftKernelModules
    if latest_version is None or current_version > latest_version:
                                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
TypeError: '>' not supported between instances of 'Version' and 'str'

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