ci(ios): use XCode version 26.x for iOS 26.x test instead of 26.1

[GitToTheHub]

Platforms affected

• iOS

Motivation and Context

• Using xcode-version: 26.x will bring the error: xcodebuild: error: Unable to find a destination matching the provided destination specifier: { generic:1, platform:iOS Simulator } and also iOS 26.1 is not installed. Please download and install the platform from Xcode > Settings > Components.. After changing xcode-version: 26.1 to xcode-version: 26.x XCode 26.5 will be choosen and the error disappears
• Example of a failed action: https://github.com/apache/cordova-plugin-inappbrowser/actions/runs/27021586873/job/79750648238?pr=1160

Description

Testing

Checklist

• I've run the tests to see all new and existing tests pass
• I added automated test coverage as appropriate for this change
• Commit is prefixed with (platform) if this change only applies to one platform (e.g. (android))
• If this Pull Request resolves an issue, I linked to the issue in the text above (and used the correct keyword to close issues using keywords)
• I've updated the documentation if necessary