QuickSearchBoxTests min sdk bump from 19 to 21

Change-Id: I0ccfabf04ce662f38a18a752c3a8f532b3c3ab4b
Bug:340711546
diff --git a/tests/Android.bp b/tests/Android.bp
index e7777c0..cdea789 100644
--- a/tests/Android.bp
+++ b/tests/Android.bp
@@ -22,7 +22,7 @@
 
 android_test {
     name: "QuickSearchBoxTests",
-    sdk_version: "19",
+    sdk_version: "21",
     srcs: ["src/**/*.java"],
     certificate: "shared",
     instrumentation_for: "QuickSearchBox",