chore(version): Remove invalid flag from help text

[tmapes]

This flag is not supported in the version command (though it would be nice to supply a Vela server and retrieve the version of the server).

[wass3rw3rk]

thanks, you're right.

vela --api.addr <url> version works (not in the way you want though)

the way the help text prints it definitely does not work.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (c8476c7) 82.40% compared to head (3c62cc6) 82.40%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #525   +/-   ##
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  Coverage   82.40%   82.40%           
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  Files         147      147           
  Lines        3580     3580           
=======================================
  Hits         2950     2950           
  Misses        466      466           
  Partials      164      164           

Files	Coverage Δ
command/version/version.go	86.66% <ø> (ø)