Have Fastlane use the latest available 26.0.x Xcode version

This comes as a potential fix for Xcode Cloud where Xcode 26.0 is no longer available and when switching the workflow to 26.0.1 it fails with `[!] Cannot find an installed Xcode satisfying '26'`

Author: stefanceriu

fastlane/Fastfile

@@ -8,7 +8,7 @@ if File.exist?(enterprise)
 end
 
 before_all do
-  xcversion(version: "26")
+  xcversion(version: "~> 26.0.0")
 
   ENV["FASTLANE_XCODEBUILD_SETTINGS_TIMEOUT"] = "180"
   ENV["FASTLANE_XCODE_LIST_TIMEOUT"] = "180"