For some spurious reason, the tree test is failing on the M1
builder; so we'll hack around by ignoring the test when run
on the M1 CI. Note to self: the test runs successfully on
a physical M1 machine so it is likely that this is a problem
with the runner.
This might make one think that we are being outrageously strict,
but at the end of the day, it can help investigate crashes
or inspect logs without artwork all over the place.
Following some discussions, the `user` mode was renamed to `dev`
mode.
This commit also upgrades some deps, other than clap which has
deprecated yaml support (we will continue to use 2.x).
Finally, the CHANGELOG was updated.