Revert "New sass version is on CRAN"

We need to wait for binary package to be built otherwise dev rmarkdown
can't install on Windows easily.

This reverts commit 19c3492.

Author: cderv

DESCRIPTION

@@ -106,12 +106,12 @@ Suggests:
     rsconnect,
     withr (>= 2.4.2),
     bslib (>= 0.2.4),
-    sass (>= 0.4.0)
+    sass (>= 0.3.1)
 SystemRequirements: pandoc (>= 1.14) - http://pandoc.org
 URL: https://github.com/rstudio/rmarkdown, https://pkgs.rstudio.com/rmarkdown/
 BugReports: https://github.com/rstudio/rmarkdown/issues
 License: GPL-3
 RoxygenNote: 7.1.1
 Encoding: UTF-8
 VignetteBuilder: knitr
-Remotes: rstudio/bslib
+Remotes: rstudio/sass, rstudio/bslib