n_flat_spots deprecation when using feature_set(pkg = "feasts")

[gordon-goodwin]

tsdaily_tenure |>
features(n_reps, feature_set(pkgs = "feasts")) yields:

Warning message:
n_flat_spots() was deprecated in feasts 0.1.5.
ℹ Please use longest_flat_spot() instead.
The deprecated feature was likely used in the fabletools package.
Please report the issue at https://github.com/tidyverts/fabletools/issues.

[mitchelloharawild]

Thanks! Fixed in {feasts}.