Bump minSdkVersion to API 14.

First step in moving minSdkVersion to API 14 for support library.

Bug: 32794064
Test: gradlew clean assemble assembleAndroidTest still works
Change-Id: I113834cc6e3c088cdf606a86fe7a35faa192b801
diff --git a/v13/build.gradle b/v13/build.gradle
index c59ef62..3529ba1 100644
--- a/v13/build.gradle
+++ b/v13/build.gradle
@@ -20,7 +20,7 @@
     compileSdkVersion project.ext.currentSdk
 
     defaultConfig {
-        minSdkVersion 13
+        minSdkVersion 14
     }
 
     sourceSets {