enable lint prefer_final_in_for_each (#47724)

diff --git a/packages/flutter_tools/lib/src/android/android_sdk.dart b/packages/flutter_tools/lib/src/android/android_sdk.dart
index 7c4ab74..50fc605 100644
--- a/packages/flutter_tools/lib/src/android/android_sdk.dart
+++ b/packages/flutter_tools/lib/src/android/android_sdk.dart
@@ -215,7 +215,7 @@
           .map<String>((String line) => line.trim())
           .where((String line) => line.isNotEmpty);
       final Map<String, String> properties = <String, String>{};
-      for (String line in propertiesFileLines) {
+      for (final String line in propertiesFileLines) {
         final List<String> parts = line.split(' = ');
         if (parts.length == 2) {
           properties[parts[0]] = parts[1];