Move library to 1.3.0 alpha

Move library version to 1.3.0 alpha01 to continue development.

Bug: 305966618
Test: ./gradlew window:window:cAT
Change-Id: Ie03d10e409d64855f085a228f640cf819a81d1a5
diff --git a/libraryversions.toml b/libraryversions.toml
index 8b83655..fbd4029 100644
--- a/libraryversions.toml
+++ b/libraryversions.toml
@@ -161,8 +161,8 @@
 WEAR_WATCHFACE = "1.3.0-alpha01"
 WEBKIT = "1.9.0-beta01"
 # Adding a comment to prevent merge conflicts for Window artifact
-WINDOW = "1.2.0-beta04"
-WINDOW_EXTENSIONS = "1.2.0-rc01"
+WINDOW = "1.3.0-alpha01"
+WINDOW_EXTENSIONS = "1.3.0-alpha01"
 WINDOW_EXTENSIONS_CORE = "1.1.0-alpha01"
 WINDOW_SIDECAR = "1.0.0-rc01"
 # Do not remove comment