Speculative fix for android_verified_input_test (flutter#177937)

This test passes when run locally as instructed in the README for the
devicelab
```
../../bin/cache/dart-sdk/bin/dart bin/test_runner.dart test -t android_verified_input_test
```

but fails on CI:

https://ci.chromium.org/ui/p/flutter/builders/staging/Linux_pixel_7pro%20android_verified_input_test/106/overview
```
[2025-11-03 11:08:04.090018] [STDOUT] stdout: [        ]   Original error: ext.flutter.driver: (-32000) Service connection disposed
[2025-11-03 11:08:04.090156] [STDOUT] stdout: [        ]   Original stack trace:
[2025-11-03 11:08:04.090199] [STDOUT] stdout: [        ]   #0      new _OutstandingRequest (package:vm_service/src/vm_service.dart:268:34)
[2025-11-03 11:08:04.091572] [STDOUT] stdout: [        ]   #1      VmService._call.<anonymous closure> (package:vm_service/src/vm_service.dart:1950:25)
[2025-11-03 11:08:04.091647] [STDOUT] stdout: [        ]   #2      VmService._call (package:vm_service/src/vm_service.dart:1962:8)
[2025-11-03 11:08:04.091674] [STDOUT] stdout: [        ]   #3      VmService.callServiceExtension (package:vm_service/src/vm_service.dart:1901:14)
[2025-11-03 11:08:04.091693] [STDOUT] stdout: [        ]   #4      VMServiceFlutterDriver.sendCommand (package:flutter_driver/src/driver/vmservice_driver.dart:327:12)
[2025-11-03 11:08:04.091713] [STDOUT] stdout: [        ]   #5      FlutterDriver.requestData (package:flutter_driver/src/driver/driver.dart:573:13)
[2025-11-03 11:08:04.091733] [STDOUT] stdout: [        ]   #6      main.<anonymous closure> (file:///opt/s/w/ir/x/w/rc/tmpv6pcbna2/flutter%20sdk/dev/integration_tests/android_verified_input/test_driver/main_test.dart:28:57)
[2025-11-03 11:08:04.091750] [STDOUT] stdout: [        ]   <asynchronous suspension>
[2025-11-03 11:08:04.091767] [STDOUT] stdout: [        ]   #7      Declarer.test.<anonymous closure>.<anonymous closure> (package:test_api/src/backend/declarer.dart:242:9)
[2025-11-03 11:08:04.091784] [STDOUT] stdout: [        ]   <asynchronous suspension>
[2025-11-03 11:08:04.092408] [STDOUT] stdout: [        ]   #8      Declarer.test.<anonymous closure> (package:test_api/src/backend/declarer.dart:240:7)
[2025-11-03 11:08:04.092472] [STDOUT] stdout: [        ]   <asynchronous suspension>
[2025-11-03 11:08:04.092502] [STDOUT] stdout: [        ]   #9      Invoker._waitForOutstandingCallbacks.<anonymous closure> (package:test_api/src/backend/invoker.dart:282:9)
```

Try copying this configuration used by other tests as a speculative fix.
I can't get this test to kick off in presubmit, so I suppose we will
just try this. The test is marked bringup anyways so it won't block the
tree if this doesn't help.

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---------

Co-authored-by: Gray Mackall <mackall@google.com>

Author: gmackall

dev/devicelab/bin/tasks/android_verified_input_test.dart

@@ -2,9 +2,11 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+import 'package:flutter_devicelab/framework/devices.dart';
 import 'package:flutter_devicelab/framework/framework.dart';
 import 'package:flutter_devicelab/tasks/integration_tests.dart';
 
 Future<void> main() async {
+  deviceOperatingSystem = DeviceOperatingSystem.android;
   await task(androidVerifiedInputTest());
 }