Update to 1.7.5 which seems to support python 3.6 correctly (at
least, all tests pass if the requirement for 3.7 is removed)

- Add patch to reduce the requirement of python 3.7 to work with
python 3.6 so borgmatic can be used in Leap 15.5 . All the tests
work fine so it seems python 3.7 isn't really required:
* support-python3.6.patch

- Update to 1.7.5:
* #463: Add "before_actions" and "after_actions" command hooks that run before/after all the
actions for each repository. These new hooks are a good place to run per-repository steps like
mounting/unmounting a remote filesystem.
* #463: Update documentation to cover per-repository configurations:
https://torsion.org/borgmatic/docs/how-to/make-per-application-backups/
* #557: Support for Borg 2 while still working with Borg 1. This includes new borgmatic actions
like "rcreate" (replaces "init"), "rlist" (list archives in repository), "rinfo" (show repository
info), and "transfer" (for upgrading Borg repositories). For the most part, borgmatic tries to
smooth over differences between Borg 1 and 2 to make your upgrade process easier. However, there
are still a few cases where Borg made breaking changes. See the Borg 2.0 changelog for more
information: https://www.borgbackup.org/releases/borg-2.0.html
* #557: If you install Borg 2, you'll need to manually upgrade your existing Borg 1 repositories
before use. Note that Borg 2 stable is not yet released as of this borgmatic release, so don't
use Borg 2 for production until it is! See the documentation for more information:
https://torsion.org/borgmatic/docs/how-to/upgrade/#upgrading-borg
* #557: Rename several configuration options to match Borg 2: "remote_rate_limit" is now
"upload_rate_limit", "numeric_owner" is "numeric_ids", and "bsd_flags" is "flags". borgmatic
still works with the old options.
* #557: Remote repository paths without the "ssh://" syntax are deprecated but still supported for
now. Remote repository paths containing "~" are deprecated in borgmatic and no longer work in
Borg 2.
* #557: Omitting the "--archive" flag on the "list" action is deprecated when using Borg 2. Use
the new "rlist" action instead.
* #557: The "--dry-run" flag can now be used with the "rcreate"/"init" action.