Extra version flag

[evilhamsterman]

The Fang library has it's own version flag option that is enabled by default and uses the BuildInfo. They just added the ability to remove it less than two weeks ago charmbracelet/fang#56.

So right now you get an extra version flag that give an erroneous response

$ containerlab --version
containerlab version unknown (built from source)

$ containerlab version
  ____ ___  _   _ _____  _    ___ _   _ _____ ____  _       _     
 / ___/ _ \| \ | |_   _|/ \  |_ _| \ | | ____|  _ \| | __ _| |__  
| |  | | | |  \| | | | / _ \  | ||  \| |  _| | |_) | |/ _` | '_ \ 
| |__| |_| | |\  | | |/ ___ \ | || |\  | |___|  _ <| | (_| | |_) |
 \____\___/|_| \_| |_/_/   \_\___|_| \_|_____|_| \_\_|\__,_|_.__/ 

    version: 0.69.0
     commit: none
       date: unknown
     source: https://github.com/srl-labs/containerlab
 rel. notes: https://containerlab.dev/rn/0.69/

[vista-]

Thanks for spotting this issue and for the PR!

I'll check it out on Monday.