Update link to bug (#62893)

packages/flutter_tools/test/general.shard/ios/xcode_backend_test.dart

@@ -57,10 +57,8 @@ void main() {
   test('Xcode backend fails for on unsupported configuration combinations', () async {
     await expectXcodeBackendFails(unknownConfiguration);
     await expectXcodeBackendFails(unknownFlutterBuildMode);
-
     await expectXcodeBackendFails(installWithoutRelease);
-
     await expectXcodeBackendFails(localEngineDebugBuildModeRelease);
     await expectXcodeBackendFails(localEngineProfileBuildeModeRelease);
-  }, skip: true); // #35707 non-hermetic test requires precache to have run.
+  }, skip: true); // https://github.com/flutter/flutter/issues/35707 (non-hermetic test requires precache to have run)
 }