[shared_preferences] Fix Android Java version issue (#3712)

Sets the compile version to 1.8, which is required by some features added in the switch to Pigeon. This is a standard part of the current Android plugin template, but this plugin predates that template change.

Fixes flutter/flutter#124839

Author: stuartmorgan-g

packages/shared_preferences/shared_preferences_android/CHANGELOG.md

@@ -1,3 +1,7 @@
+## 2.1.2
+
+* Sets the required Java compile version to 1.8 for new features used in 2.1.1.
+
 ## 2.1.1
 
 * Updates minimum Flutter version to 3.0.

packages/shared_preferences/shared_preferences_android/android/build.gradle

@@ -32,6 +32,11 @@ apply plugin: 'com.android.library'
 android {
     compileSdkVersion 33
 
+    compileOptions {
+        sourceCompatibility JavaVersion.VERSION_1_8
+        targetCompatibility JavaVersion.VERSION_1_8
+    }
+
     defaultConfig {
         minSdkVersion 16
         testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"

packages/shared_preferences/shared_preferences_android/pubspec.yaml

@@ -2,7 +2,7 @@ name: shared_preferences_android
 description: Android implementation of the shared_preferences plugin
 repository: https://github.com/flutter/packages/tree/main/packages/shared_preferences/shared_preferences_android
 issue_tracker: https://github.com/flutter/flutter/issues?q=is%3Aissue+is%3Aopen+label%3A%22p%3A+shared_preferences%22
-version: 2.1.1
+version: 2.1.2
 
 environment:
   sdk: ">=2.17.0 <4.0.0"