Log Message:
net/unison: Update to 2.53.6

## Changes in 2.53.6

Released 2024-11-04

  * Remove workaround for Windows DST: Time differences of one hour
    are no longer treated as not different.
  * Time remaining, when over 24h, shown as days and HMS instead of
    just HMS.
  * Stop using deprecated [GdkPixbuf.from_xpm_data] (avoids problems
    with some versions of gdkpixbuf).  Attempt to avoid soundness
    issues with lablgtk while doing so.

  Deprecation warning: support for external rsync will be removed,
  likely in 2.54.0.

  DEPRECATION MAY HAPPEN WITH LESS THAN TYPICAL NOTICE:
  lablgtk is difficult to use safely, and future maintenance is
  unclear.  Implementing the GUI without lablgtk requires more effort
  than seems likely to happen.  Thus, it is possible that support for
  the unison GUI may end suddenly, on a particular platform, or on all
  platforms -- even in a micro release.  See
    https://github.com/bcpierce00/unison/issues/1075