Bump version to 1.4.0-alpha1

Change-Id: Iebb3a93f0018659ac54f6b87a0470b5649ce6cab
diff --git a/base/version.gradle b/base/version.gradle
index 57a952a..d8babc7 100644
--- a/base/version.gradle
+++ b/base/version.gradle
@@ -1,5 +1,5 @@
-project.ext.baseVersion = '24.3.0-beta3'
-project.ext.buildVersion = '1.3.0-beta3'
+project.ext.baseVersion = '24.4.0-alpha1'
+project.ext.buildVersion = '1.4.0-alpha1'
 
 // This counter should be incremented every time the api is changed in not backward-compatible way,
 // i.e. it should be incremented from N to N+1 only when the api is changed in a way that existing