[MacPorts] #52550: ghc-bootstrap: bump to 7.6.3

[MacPorts]

#52550: ghc-bootstrap: bump to 7.6.3
----------------------------+------------------------
  Reporter:  grimreaper     |      Owner:  neverpanic
      Type:  update         |     Status:  closed
  Priority:  Normal         |  Milestone:
 Component:  ports          |    Version:
Resolution:  fixed          |   Keywords:  haspatch
      Port:  ghc-bootstrap  |
----------------------------+------------------------
Changes (by neverpanic):

 * status:  assigned => closed
 * resolution:   => fixed


Comment:

 This is fixed with the recent update to GHC 8.6 as merged in
 ​https://github.com/macports/macports-ports/pull/4794.

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Ticket URL: <https://trac.macports.org/ticket/52550#comment:3>
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