Bump AOSP Dialer version to 2.3

Change-Id: I2c9c594c98568b2c550b482e338a4f0fc81198dd
diff --git a/AndroidManifest.xml b/AndroidManifest.xml
index 32d88cc..1faab2a 100644
--- a/AndroidManifest.xml
+++ b/AndroidManifest.xml
@@ -17,8 +17,8 @@
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
     package="com.android.dialer"
     coreApp="true"
-    android:versionCode="20210"
-    android:versionName="2.21">
+    android:versionCode="20300"
+    android:versionName="2.3">
 
     <uses-sdk
         android:minSdkVersion="23"