Log Message:
(geography/R-terra) Updated 1.8.15 to 1.8.21

# version 1.8-21

## bug fixes

- `sieve` failed with large rasters
  [#1729](https://github.com/rspatial/terra/issues/1729) by Reed
  Humphrey

- `extractRange` only worked for SpatVector, not for matrix or vector
  [#1733](https://github.com/rspatial/terra/issues/1733) by Victor Van
  der Meersch

- `extract<SpatRaster>` over https with a multilayer SpatRaster
  returned the values for the first layer for all layer
  [#1736](https://github.com/rspatial/terra/issues/1736) by Shannon
  Albeke

## enhancements

- new argument xyz="" to the `rast<SpatVector>` method

- new arguments "type" and "breaks" to \ 
`plet<SpatRaster>` method
  [#1187](https://github.com/rspatial/terra/issues/1187) by Augustin
  Lobo

- new argument "cores" in `lapp<SpatRasterDataset>`
  [#1190](https://github.com/rspatial/terra/issues/1190) by kel44

- `aggregate<SpatRaster>` now handles `fun="table"`
  [#1662](https://github.com/rspatial/terra/issues/1662) by Fernando
  Aramburu.

## new

- `is.flipped<SpatRaster>` method
  [#1627](https://github.com/rspatial/terra/issues/1627)>` by Timothée
  Giraud

- `as.array<SpatRasterDataset>` method

- `distance<SpatRaster,missing>` now has argument "values". If TRUE,
  the values of the nearest non-target cell is returned instead of the
  distance [#1243](https://github.com/rspatial/terra/is sues/1243) by
  Simon Dedman

- `thresh<SpatRaster>`
  [#1233](https://github.com/rspatial/terra/issues/1233) by Agustin
  Lobo