[Xamarin.Android.Tools.AndroidSdk] Update SDK component for API-34 (#211)

Update `$(AndroidSdkPlatformVersion)` to android-34.
API-34 has been declared stable by Google, and will be the default
API level for .NET 8.

Author: tondat

src/Xamarin.Android.Tools.AndroidSdk/Xamarin.Android.Tools.Versions.props

@@ -13,7 +13,7 @@
     <AndroidCommandLineToolsVersion Condition=" '$(AndroidCommandLineToolsVersion)' == '' ">7.0</AndroidCommandLineToolsVersion>
     <AndroidSdkPlatformToolsVersion Condition="'$(AndroidSdkPlatformToolsVersion)' == ''">34.0.1</AndroidSdkPlatformToolsVersion>
     <AndroidSdkEmulatorVersion Condition="'$(AndroidSdkEmulatorVersion)' == ''"></AndroidSdkEmulatorVersion>
-    <AndroidSdkPlatformVersion Condition="'$(AndroidSdkPlatformVersion)' == ''">android-33</AndroidSdkPlatformVersion>
+    <AndroidSdkPlatformVersion Condition="'$(AndroidSdkPlatformVersion)' == ''">android-34</AndroidSdkPlatformVersion>
     <AndroidNdkVersion Condition="'$(AndroidNdkVersion)' == ''">24.0.8215888</AndroidNdkVersion>
 
     <!-- obsolete; should consider removing eventually -->