CompatHelper: bump compat for "Images" to "0.21" (#109)

* CompatHelper: bump compat for "Images" to "0.21"

* Update Project.toml

Co-authored-by: Johnny Chen <[email protected]>

Author: github-actions[bot]

Project.toml

@@ -44,7 +44,7 @@ ImageMagick = "0, 1"
 ImageMetadata = "0"
 ImageSegmentation = "1"
 ImageShow = "0"
-Images = "0.20"
+Images = "0.21"
 MappedArrays = "0"
 MosaicViews = "0"
 PaddedViews = "0"