upgrade platform should use platform version from cloud-env

[hekonsek]

jx upgrade platform should use the version of platform read from cloud-env or passed via --version option. Right now we're ignoring that version and upgrade platform to the latest version anyway.

[jenkins-x-bot]

Hi @hekonsek. Thanks for your PR.

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[jstrachan]

/approve /lgtm

[jenkins-x-bot]

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[jstrachan]

/ok-to-test