[webview_flutter_android][webview_flutter_wkwebview] Fixes unawaited_futures violations (#4354)

For flutter/flutter#127323

Author: bparrishMines

packages/webview_flutter/webview_flutter_android/CHANGELOG.md

@@ -1,3 +1,7 @@
+## 3.8.2
+
+* Fixes unawaited_futures violations.
+
 ## 3.8.1
 
 * Bumps androidx.webkit:webkit from 1.6.0 to 1.7.0.

packages/webview_flutter/webview_flutter_android/analysis_options.yaml

@@ -29,7 +29,7 @@ Future<void> main() async {
   IntegrationTestWidgetsFlutterBinding.ensureInitialized();
 
   final HttpServer server = await HttpServer.bind(InternetAddress.anyIPv4, 0);
-  server.forEach((HttpRequest request) {
+  unawaited(server.forEach((HttpRequest request) {
     if (request.uri.path == '/hello.txt') {
       request.response.writeln('Hello, world.');
     } else if (request.uri.path == '/secondary.txt') {
@@ -42,7 +42,7 @@ Future<void> main() async {
       fail('unexpected request: ${request.method} ${request.uri}');
     }
     request.response.close();
-  });
+  }));
   final String prefixUrl = 'http://${server.address.address}:${server.port}';
   final String primaryUrl = '$prefixUrl/hello.txt';
   final String secondaryUrl = '$prefixUrl/secondary.txt';