fix(workspace): pin UniTask consumer source

Tools/UpmConsumerValidation/Validate-UpmConsumer.ps1

@@ -179,7 +179,7 @@ if (Test-Path -LiteralPath $consumerRoot) {
 New-Item -ItemType Directory -Path $packagesPath, $assetsEditorPath, $projectSettingsPath -Force | Out-Null
 
 $dependencies = [ordered]@{
-    'com.cysharp.unitask' = 'https://github.com/Cysharp/UniTask.git?path=src/UniTask/Assets/Plugins/UniTask'
+    'com.cysharp.unitask' = 'https://github.com/Cysharp/UniTask.git?path=src/UniTask/Assets/Plugins/UniTask#7c0f199fe0d3fc528024488ccd671e6c7b27745b'
     'com.unity.nuget.newtonsoft-json' = '3.2.2'
     'com.unity.test-framework' = '1.1.33'
     'com.unity.textmeshpro' = '3.0.7'