chore: update scripts/update-java.ps1 to 8.21.1

Author: web-flow

src/Sentry.Bindings.Android/Sentry.Bindings.Android.csproj

@@ -1,7 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk">
   <PropertyGroup>
     <TargetFrameworks>net8.0-android34.0;net9.0-android35.0</TargetFrameworks>
-    <SentryAndroidSdkVersion>8.21.0</SentryAndroidSdkVersion>
+    <SentryAndroidSdkVersion>8.21.1</SentryAndroidSdkVersion>
     <SentryAndroidSdkDirectory>$(BaseIntermediateOutputPath)sdks\$(TargetFramework)\Sentry\Android\$(SentryAndroidSdkVersion)\</SentryAndroidSdkDirectory>
     <!-- This gets resolved by the DownloadSentryAndroidSdk target -->
     <SentryNativeNdkVersion></SentryNativeNdkVersion>