ggplot2 3.4.4

This hotfix release adapts to a change in r-devel's base::is.atomic() and
the upcoming retirement of maptools.

• fortify() for sp objects (e.g., SpatialPolygonsDataFrame) is now deprecated
  and will be removed soon in support of the upcoming retirement of rproj, rgeos,
  and maptools. In advance
  of the whole removal, fortify(<SpatialPolygonsDataFrame>, region = ...)
  no longer works as of this version (@yutannihilation, #5244).