deps android: Upgrade Android Gradle Plugin to 8.9.1, from 8.5.2

Release notes:
  https://developer.android.com/build/releases/past-releases/agp-8-6-0-release-notes
  https://developer.android.com/build/releases/past-releases/agp-8-7-0-release-notes
  https://developer.android.com/build/releases/past-releases/agp-8-8-0-release-notes
  https://developer.android.com/build/releases/gradle-plugin (for 8.9, for now)

Changes mostly seem to be bug fixes to various components.

One notable change is that AGP version 8.9 now requires
Android Studio Meerkat (2024.3.1 Patch 1).

Additionally, use the new extension `toUri` to make the linter
happy.

Author: rajveermalviya

android/app/src/main/kotlin/com/zulip/flutter/ZulipPlugin.kt

@@ -19,6 +19,7 @@ import androidx.core.app.NotificationCompat
 import androidx.core.app.NotificationManagerCompat
 import androidx.core.graphics.drawable.IconCompat
 import io.flutter.embedding.engine.plugins.FlutterPlugin
+import androidx.core.net.toUri
 
 private const val TAG = "ZulipPlugin"
 
@@ -64,7 +65,7 @@ private class AndroidNotificationHost(val context: Context)
                 channel.name?.let { setName(it) }
                 channel.lightsEnabled?.let { setLightsEnabled(it) }
                 channel.soundUrl?.let {
-                    setSound(Uri.parse(it),
+                    setSound(it.toUri(),
                         AudioAttributes.Builder().setUsage(AudioAttributes.USAGE_NOTIFICATION).build())
                 }
                 channel.vibrationPattern?.let { setVibrationPattern(it) }
@@ -199,7 +200,7 @@ private class AndroidNotificationHost(val context: Context)
                     it.requestCode.toInt(),
                     it.intent.let { intent -> Intent(
                         intent.action,
-                        Uri.parse(intent.dataUrl),
+                        intent.dataUrl.toUri(),
                         context,
                         MainActivity::class.java
                     ).apply {

android/gradle.properties

@@ -6,7 +6,7 @@ android.enableJetifier=true
 # Defining them here makes them available both in
 # settings.gradle and in the build.gradle files.
 
-agpVersion=8.5.2
+agpVersion=8.9.1
 
 # Generally update this to the version found in recent releases
 # of Android Studio, as listed in this table: