deps: Update whats-my-line to bump dugite to 2.1.0

Updating from a non-`master` branch commit of `whats-my-line` repo
for now, to get the `dugite` version syncing/deduping effort landed in
core repo sooner, since the `superstring` stuff is taking longer than
the `dugite` stuff.

There's no sense delaying the `dugite` stuff just to do
the `superstring` stuff together at the same (potentially much later)
time. Better to get each done "right" and land each when it's ready,
IMO.

So here's this. No `superstring` bumps, just pinning `dugite` to 2.1.0