target-sdk-version update from 29 to 30

usbSerialExamples/build.gradle

@@ -1,8 +1,8 @@
 apply plugin: 'com.android.application'
 
 android {
-    compileSdkVersion 29
-    buildToolsVersion '29.0.3'
+    compileSdkVersion 30
+    buildToolsVersion '30.0.3'
 
     compileOptions {
         sourceCompatibility JavaVersion.VERSION_1_8
@@ -11,7 +11,7 @@ android {
 
     defaultConfig {
         minSdkVersion 17
-        targetSdkVersion 29
+        targetSdkVersion 30
         vectorDrawables.useSupportLibrary = true
 
         testInstrumentationRunner "android.test.InstrumentationTestRunner"