[R] fix version (#1525)

Author: eitsupi

containers/r/.devcontainer/devcontainer.json

@@ -3,7 +3,7 @@
 	"build": {
 		"dockerfile": "Dockerfile",
 		"args": {
-			// Update VARIANT to pick a R version: 4, 4.1, 4.0
+			// Update VARIANT to pick a R version: 4, 4.2, 4.1, 4.0
 			"VARIANT": "4",
 			// Start with a minimal image (rocker/r-ver) or a expanded image.
 			// See more details about rocker/r-ver's derived images: https://github.com/rocker-org/rocker-versioned2