[MacPorts] #29609: Update hgsubversion to version 1.2.1

[MacPorts]

#29609: Update hgsubversion to version 1.2.1
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 Reporter:  wolfgang.lux@…          |       Owner:  macports-tickets@…                   
     Type:  enhancement             |      Status:  new                                  
 Priority:  Normal                  |   Milestone:                                       
Component:  ports                   |     Version:  1.9.2                                
 Keywords:                          |        Port:                                       
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 Pleas upgrade hgsubversion to 1.2.1. The current version is 1.1.2 and it
 doesn't support the --startrev option.

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Ticket URL: <https://trac.macports.org/ticket/29609>
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