Fix `flow version` output bug

[jribbink]

Closes #1489

Description

Fix flow version output to use stdout instead & remove log package use (not necessary, can be done via RunE in cobra, & this way exit code is also correct, was returning exit 0 always previously)

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For contributor use:

• [ ] Targeted PR against master branch
• [x] Linked to Github issue with discussion and accepted design OR link to spec that describes this work
• [x] Code follows the standards mentioned here
• [ ] Updated relevant documentation
• [x] Re-reviewed Files changed in the Github PR explorer
• [x] Added appropriate labels

[jribbink]

Just ran the command again, and cobra seems to be printing usage information + printing the error twice when RunE encounters an error... looking for a workaround.