Updated target SDK from 28 to 29.

Merged the following change from internal source: cl/305938566

Do not use EXTRA_IS_HANDOVER for API levels 28 and above

When targeting API level 29, this field becomes blacklisted.
Since the Handover feature is officially supported via a public API since
API level 28, we do not need to check for the internal field when the API level
is 28+.

go/forrest_run/L11100000565062425
BUG: 143990966
Test: manual and CTS tests.

Change-Id: Ib3fda29b4d5714efc52b29f49ca4a9a310584fff
diff --git a/AndroidManifest.xml b/AndroidManifest.xml
index fe8147f..a93fe2a 100644
--- a/AndroidManifest.xml
+++ b/AndroidManifest.xml
@@ -21,7 +21,7 @@
 
   <uses-sdk
     android:minSdkVersion="24"
-    android:targetSdkVersion="28"/>
+    android:targetSdkVersion="29"/>
 
   <uses-permission android:name="android.permission.CALL_PHONE"/>
   <uses-permission android:name="android.permission.READ_CONTACTS"/>