[MacPorts] #35872: git-flow: update to use github PortGroup

[MacPorts]

#35872: git-flow: update to use github PortGroup
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 Reporter:  jason-macports@…          |       Owner:  macports-tickets@…                   
     Type:  update                    |      Status:  new                                  
 Priority:  Normal                    |   Milestone:                                       
Component:  ports                     |     Version:                                       
 Keywords:  haspatch maintainer       |        Port:  git-flow                             
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 Few `Portfile` updates:
  * use `PortGroup github`
  * add `openmaintainer` (so I don't slow things down)
  * submodule update to single git command

 As a question, has anyone considered making `--recursive` a default option
 on the `git clone` to address `submodule` captures?

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Ticket URL: <https://trac.macports.org/ticket/35872>
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