chore: bump gradle

Author: MichaelVerdon

packages/firebase_database/firebase_database/android/local-config.gradle

@@ -3,5 +3,5 @@ ext {
     minSdk=23
     targetSdk=34
     javaVersion = JavaVersion.toVersion(17)
-    androidGradlePluginVersion = '8.3.0'
+    androidGradlePluginVersion = '8.6.0'
 }

packages/firebase_database/firebase_database/android/src/main/kotlin/io/flutter/plugins/firebase/database/FlutterDataSnapshotPayload.kt

@@ -16,8 +16,8 @@ class FlutterDataSnapshotPayload(snapshot: DataSnapshot) {
         val snapshotMap = mutableMapOf<String, Any>()
 
         snapshotMap[Constants.KEY] = snapshot.key ?: ""
-        snapshotMap[Constants.VALUE] = snapshot.value ?: null
-        snapshotMap[Constants.PRIORITY] = snapshot.priority ?: null
+        snapshotMap[Constants.VALUE] = snapshot.value
+        snapshotMap[Constants.PRIORITY] = snapshot.priority
 
         val childrenCount = snapshot.childrenCount.toInt()
         if (childrenCount == 0) {

packages/firebase_database/firebase_database/android/src/main/kotlin/io/flutter/plugins/firebase/database/TransactionHandler.kt

@@ -36,7 +36,7 @@ class TransactionHandler @JvmOverloads constructor(
         val transactionArgs = mutableMapOf<String, Any>()
 
         snapshotMap[Constants.KEY] = currentData.key ?: ""
-        snapshotMap[Constants.VALUE] = currentData.value ?: null
+        snapshotMap[Constants.VALUE] = currentData.value
 
         transactionArgs[Constants.SNAPSHOT] = snapshotMap
         transactionArgs[Constants.TRANSACTION_KEY] = transactionKey

tests/android/gradle/wrapper/gradle-wrapper.properties

@@ -2,4 +2,4 @@ distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-8.4-all.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-8.7-all.zip

tests/android/settings.gradle

@@ -18,7 +18,7 @@ pluginManagement {
 
 plugins {
     id "dev.flutter.flutter-plugin-loader" version "1.0.0"
-    id "com.android.application" version "8.3.0" apply false
+    id "com.android.application" version "8.6.0" apply false
     id "org.jetbrains.kotlin.android" version "2.1.0" apply false
 }