Attempt fixing session verification cancellation test flakiness and pinning the Xcode version on all workflows

.github/workflows/ui_tests.yml

@@ -18,11 +18,6 @@ jobs:
       cancel-in-progress: true
 
     steps:
-      - name: Setup Xcode version
-        uses: maxim-lobanov/setup-xcode@v1.4.1
-        with:
-          xcode-version: '13.4'
-
       - uses: actions/checkout@v3
         with:
           lfs: true

ElementX/Sources/Services/SessionVerification/MockSessionVerificationControllerProxy.swift

@@ -42,7 +42,8 @@ struct MockSessionVerificationControllerProxy: SessionVerificationControllerProx
     }
     
     func declineVerification() async -> Result<Void, SessionVerificationControllerProxyError> {
-        DispatchQueue.global(qos: .background).asyncAfter(deadline: .now() + 2.0) {
+        Task.detached {
+            try await Task.sleep(nanoseconds: 2_000_000_000)
             callbacks.send(.cancelled)
         }
         
@@ -50,7 +51,8 @@ struct MockSessionVerificationControllerProxy: SessionVerificationControllerProx
     }
     
     func cancelVerification() async -> Result<Void, SessionVerificationControllerProxyError> {
-        DispatchQueue.global(qos: .background).asyncAfter(deadline: .now() + 2.0) {
+        Task.detached {
+            try await Task.sleep(nanoseconds: 2_000_000_000)
             callbacks.send(.cancelled)
         }
         

fastlane/Fastfile

@@ -1,6 +1,10 @@
 require 'yaml'
 require_relative 'changelog'
 
+before_all do
+  xcversion(version: "~> 13.4")
+end
+
 lane :alpha do
 
   config_xcodegen_alpha()