Uploading update version on App Store

I have working on this project for quite some time now and even uploaded several version to App Store Connect and have one version to be approved on App Store Review.

the problem was my MacBook I was working on crashed and need to reinstall everything from ground up.

my IOS app scripts are on Git that can retrieved it easily, now when I'm trying to archive and Distribute the changes form this newly fresh installed MacBook.

xCode says i need to update my SDK version:

"SDK Version Issue. This app was built with the iOS 14.5 SDK. All iOS apps submitted to the App Store must be built with the iOS 15 SDK or later, included in Xcode 13 or later."

I know when you have existing app on the store you won't be bothered by this but why?