ci: remove unsupported option

Author: Flash0ver

.github/workflows/device-tests-ios.yml

@@ -33,7 +33,7 @@ jobs:
       # macOS 15 (Arm64) runners (and later) only include three most recent platform tools of installed Xcode versions
       # see https://github.com/actions/runner-images/issues/12541
       - name: Download Xcode components
-        run: xcodebuild -downloadPlatform iOS -exportPath ~/Downloads -buildVersion 18.0 -architectureVariant arm64
+        run: xcodebuild -downloadPlatform iOS -exportPath ~/Downloads -buildVersion 18.0
 
       - name: Build iOS Test App
         run: pwsh ./scripts/device-test.ps1 ios -Build