[MacPorts] #61977: borgbackup @1.1.13: Update python.default_version to 38 or 39 to allow arm64 build

[MacPorts]

#61977: borgbackup @1.1.13: Update python.default_version to 38 or 39 to allow
arm64 build
--------------------+------------------------
 Reporter:  kneeal  |      Owner:  (none)
     Type:  update  |     Status:  new
 Priority:  Normal  |  Milestone:
Component:  ports   |    Version:  2.6.4
 Keywords:          |       Port:  borgbackup
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 The borgbackup python.default_version is currently 37 (python 3.7). Python
 3.7 cannot be built for Apple Silicon arm64 on bigsur and will not be
 supported.

 Python 3.8 and 3.9 are supported by borgbackup and appear to build fine
 (at least with -universal) with arm64. Suggest the portfile is updated to
 make compatible with arm64 by specifying python.default_version 38 or 39.

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Ticket URL: <https://trac.macports.org/ticket/61977>
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