[tahoe-lafs-trac-stream] [Tahoe-LAFS] #4136: CI: MacOS runners require a more recent image

[Tahoe-LAFS]

#4136: CI: MacOS runners require a more recent image
---------------------------+---------------------------
 Reporter:  hacklschorsch  |          Owner:
     Type:  defect         |         Status:  new
 Priority:  normal         |      Milestone:  undecided
Component:  unknown        |        Version:  n/a
 Keywords:                 |  Launchpad Bug:
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 The mac builders have started failing:

 For example here: https://github.com/tahoe-lafs/tahoe-
 lafs/actions/runs/12145353362/job/33866787645?pr=1398

 > The macOS-12 environment is deprecated, consider switching to macOS-13,
 macOS-14 (macos-latest) or macOS-15. For more details, see
 > https://github.com/actions/runner-images/issues/10721

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Ticket URL: <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/4136>
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