fix failing tests

flutter/example/lib/main.dart

@@ -306,7 +306,7 @@ Future<void> makeWebRequest(BuildContext context) async {
   final client = SentryHttpClient();
   // We don't do any exception handling here.
   // In case of an exception, let it get caught and reported to Sentry
-  final response = await client.get('https://flutter.dev/');
+  final response = await client.get(Uri.parse('https://flutter.dev/'));
 
   await showDialog<void>(
     context: context,

flutter/lib/src/version.dart

@@ -1,5 +1,5 @@
 /// The SDK version reported to Sentry.io in the submitted events.
-const String sdkVersion = '4.0.7';
+const String sdkVersion = '4.0.8';
 
 /// The default SDK name reported to Sentry.io in the submitted events.
 const String sdkName = 'sentry.dart.flutter';