Mac_staging plugin_test_ios keeps failing in staging #88794
Description
Mac_staging plugin_test_ios was recently enabled in staging, but keeps failing with the following log.
Related: #86802
Example build: https://ci.chromium.org/ui/p/flutter/builders/staging/Mac_staging%20plugin_test_ios/58/overview
Seems we need a higher version of xcode:
[plugin_test_ios] [STDOUT] stderr: [ +20 ms] Found "Xcode 12.0, Build version 12A7209". Xcode 12.0.1 or greater is required to develop for iOS.
[plugin_test_ios] [STDOUT] stdout: [ +3 ms] "flutter ios" took 5,064ms.
[plugin_test_ios] [STDOUT] stderr: [ +3 ms] Encountered error while building for device.
[plugin_test_ios] [STDOUT] stderr: [ ]
[plugin_test_ios] [STDOUT] stderr: #0 throwToolExit (package:flutter_tools/src/base/common.dart:10:3)
[plugin_test_ios] [STDOUT] stderr: #1 _BuildIOSSubCommand.runCommand (package:flutter_tools/src/commands/build_ios.dart:277:7)
[plugin_test_ios] [STDOUT] stderr: <asynchronous suspension>
[plugin_test_ios] [STDOUT] stderr: #2 FlutterCommand.run.<anonymous closure> (package:flutter_tools/src/runner/flutter_command.dart:1125:27)
[plugin_test_ios] [STDOUT] stderr: <asynchronous suspension>
[plugin_test_ios] [STDOUT] stderr: #3 AppContext.run.<anonymous closure> (package:flutter_tools/src/base/context.dart:150:19)
[plugin_test_ios] [STDOUT] stderr: <asynchronous suspension>
[plugin_test_ios] [STDOUT] stderr: #4 CommandRunner.runCommand (package:args/command_runner.dart:209:13)
[plugin_test_ios] [STDOUT] stderr: <asynchronous suspension>
[plugin_test_ios] [STDOUT] stderr: #5 FlutterCommandRunner.runCommand.<anonymous closure> (package:flutter_tools/src/runner/flutter_command_runner.dart:288:9)
[plugin_test_ios] [STDOUT] stderr: <asynchronous suspension>
[plugin_test_ios] [STDOUT] stderr: #6 AppContext.run.<anonymous closure> (package:flutter_tools/src/base/context.dart:150:19)
[plugin_test_ios] [STDOUT] stderr: <asynchronous suspension>
[plugin_test_ios] [STDOUT] stderr: #7 FlutterCommandRunner.runCommand (package:flutter_tools/src/runner/flutter_command_runner.dart:236:5)
[plugin_test_ios] [STDOUT] stderr: <asynchronous suspension>
[plugin_test_ios] [STDOUT] stderr: #8 run.<anonymous closure>.<anonymous closure> (package:flutter_tools/runner.dart:62:9)
[plugin_test_ios] [STDOUT] stderr: <asynchronous suspension>
[plugin_test_ios] [STDOUT] stderr: #9 AppContext.run.<anonymous closure> (package:flutter_tools/src/base/context.dart:150:19)
[plugin_test_ios] [STDOUT] stderr: <asynchronous suspension>
[plugin_test_ios] [STDOUT] stderr: #10 main (package:flutter_tools/executable.dart:92:3)
[plugin_test_ios] [STDOUT] stderr: <asynchronous suspension>