[MacPorts] #26817: Update to maven portfile

[MacPorts]

#26817: Update to maven portfile
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 Reporter:  jendave@…          |       Owner:  macports-tickets@…                   
     Type:  update             |      Status:  new                                  
 Priority:  Normal             |   Milestone:                                       
Component:  ports              |     Version:  1.9.1                                
 Keywords:                     |        Port:                                       
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Comment(by jendave@…):

 Updated the maven portfile. I added myself as a maintainer, added the mode
 line and converted the tabs to spaces.

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Ticket URL: <https://trac.macports.org/ticket/26817#comment:1>
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