[Android] Update plugin and module templates to use Flutter constant for...

[Android] Update plugin and module templates to use Flutter constant for `compileSdkVersion` (#128073)

Updates plugin and module templates to use Flutter constant for `compileSdkVersion`.

packages/flutter_tools/templates/module/android/deferred_component/build.gradle.tmpl

@@ -19,7 +19,7 @@ if (flutterVersionName == null) {
 apply plugin: "com.android.dynamic-feature"
 
 android {
-    compileSdkVersion 31
+    compileSdkVersion flutter.compileSdkVersion
 
     compileOptions {
         sourceCompatibility JavaVersion.VERSION_1_8

packages/flutter_tools/templates/plugin/android-kotlin.tmpl/build.gradle.tmpl

@@ -29,7 +29,7 @@ android {
         namespace '{{androidIdentifier}}'
     }
 
-    compileSdkVersion 31
+    compileSdkVersion {{compileSdkVersion}}
 
     compileOptions {
         sourceCompatibility JavaVersion.VERSION_1_8