Bump API_LEVEL so we can use androidx prebuilts am: ff4f656ad5 am: 2858714850

Original change: https://android-review.googlesource.com/c/platform/tools/metalava/+/2061258

Change-Id: I9d338e39c024b267808b42883dbb8f528f22ea3b
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>
diff --git a/src/test/java/com/android/tools/metalava/DriverTest.kt b/src/test/java/com/android/tools/metalava/DriverTest.kt
index 7d8bb88..b8f2f85 100644
--- a/src/test/java/com/android/tools/metalava/DriverTest.kt
+++ b/src/test/java/com/android/tools/metalava/DriverTest.kt
@@ -1340,7 +1340,7 @@
     }
 
     companion object {
-        private const val API_LEVEL = 30
+        private const val API_LEVEL = 31
 
         private fun getAndroidJarFromEnv(apiLevel: Int): File {
             val sdkRoot = System.getenv("ANDROID_SDK_ROOT")