Merge cherrypicks of ['android-review.googlesource.com/3436387'] into androidx-window-extensions-release.

Change-Id: Ifabd348da18da975cf4eed72651b3bbd0a7efe2a

libraryversions.toml

diff --git a/libraryversions.toml b/libraryversions.toml
index bee8c21..2ec6a01 100644
--- a/libraryversions.toml
+++ b/libraryversions.toml
@@ -176,7 +176,7 @@
 WEBKIT = "1.13.0-alpha03"
 # Adding a comment to prevent merge conflicts for Window artifact
 WINDOW = "1.4.0-beta01"
-WINDOW_EXTENSIONS = "1.4.0-rc01"
+WINDOW_EXTENSIONS = "1.4.0"
 WINDOW_EXTENSIONS_CORE = "1.1.0-alpha01"
 WINDOW_SIDECAR = "1.0.0-rc01"
 WORK = "2.10.0-rc01"