[MacPorts] #64396: samba4: Update to 4.15.3

[MacPorts]

#64396: samba4: Update to 4.15.3
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  Reporter:  BjarneDMat  |      Owner:  ryandesign
      Type:  update      |     Status:  closed
  Priority:  Normal      |  Milestone:
 Component:  ports       |    Version:
Resolution:  fixed       |   Keywords:  haspatch
      Port:  samba4      |
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Comment (by BjarneDMat):

 according to https://bugzilla.samba.org/show_bug.cgi?id=8773 patch-macos-
 grouplimit.diff is no longer needed as it's marked as fixed

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Ticket URL: <https://trac.macports.org/ticket/64396#comment:20>
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